1. A number is mistakenly divided by 5 instead of being multiplied by 5. Find the percentage change in the result due to mistake.?
(a) 96% (b) 95% (c) 2400% (d) 200% (e) none
2. In a mixture of 80 litres of milk and water, 25% of the mixture is milk.How much water should be added to the mixture so that milk becomes 20% of the mixture.?
3. At an election, the candidate who got 56% of the votes cast won by 144 votes. Find the total number of the voters on the voting list if 80% people cast their vote and there were no invalid votes.?
(a) 360 (b) 720 (c) 1800 (d) 1500 (e) 1600
4. Ram spends 20% of his monthly income on his house hold expenditure, 15% of the rest on books, 30% of the rest on clothes and saves the rest. On counting, he comes to know that he has finally saved Rs. 9520.Find his monthly income.?
(a) 10000 (b) 15000 (c) 20000 (d) 12000 (e) none
5. In an examination, Mohit obtained 20% more than Sushant but 10% less than Rajesh. If the marks obtained by Sushant is 1080,find the percentage marks obtained by Rajesh if the full marks is 2000.?
@techsurge said: A person borrowed a certain sum at the rate of 20% p.a compound interest. He paid a total of Rs 4000 in two annual equal installments. what is the interest paid ?a - 955b - 944c - 933d - 922could anyone tell me what's wrong my approachlet loan be P and compounded annually for 2 years on 20 % meansA= P(1.2)^2 =1.44 PNow let installment be equal to xx=4000interest on 1st installment =0.2x => amount =1.2x= 4800no interest on 2nd installment so amount =4000total =88008800 =1.44 PP = 6111.11interest =8000-6111.11 = 1888.888where am i wrong
See the parts I have emphasized in bold above: The total he paid is 4000 for 2 instalments. You have taken each as 4000. Taking each as 2000 should correct it?
@ScatterBrain16 said: A train encounters 38 intermediate stations between two cities. In how many ways can the train stop at exactly 3 intermediate stations such that no two of them are consecutive?1) 65452) 59843) 71404) 8436
Let's represent stations chosen by 1 and stations not chosen by 0. Consider that three stations are chosen, we need to put two non-chosen in between, like so: 1 0 1 0 1
Now the remaining 38 - 5 i.e. 33 stations can be placed anywhere in the four regions (before the first chosen one, between first and second, between second and third, after third) and this can be done by theory of partitioning - 33 in 4 groups = (33+3)C3 which is how they are getting 36C3.
Someone had asked a similar problem earlier too (on the same thread I guess) about ten seats and 3 people who cannot be seated on consecutive seats. I had posted a slightly more detailed answer there...can't locate it now :(
(BTW if we wanted all to be consecutive we would get 36 ways and not 36C3...please consider!)
WHAT WAS THE COST PRICE OF WATCH ? 1) THE SHOPKEEPER LABELLED THE PRICE OF THE WATCH 20% ABOVE THE COST PRICE 2) AFTER ALLOWING A DISCOUNT OF 15 % ON THE LABELLED PRICE , THE SHOPKEEPER CHARSES RUPEES 408 FOR THE WATCH 3)HAD THERE BEEN NO DISCOUNT , THE SHOPKEEPER WOULD HAVE EARNED 20% PROFIT . OPTINS :- A) 1 AND EITHER 2 OR 3 IS REQUIRED FOR ANSWER B) 2 AND EITHER 1OR 3 C) 3 AND EITHER 1 OR 2 D) 1 AND 2 ONLY E) ANY TWO OF THE THREE
question from R S AGGRAWAL and pls provide solution in detail
what was the percentage discount given ? a) 23.5% profit was earned by selling an almirah for Rs.12350. b)if there were no discount , the earned profit would have been 30% c)the cost price of almirah is 10000 rs option 1)only a and b is required for answering the question 2)only b and c 3) only a and c 4) any two of three 5) none of these
what was the percentage discount given ? a) 23.5% profit was earned by selling an almirah for Rs.12350. b)if there were no discount , the earned profit would have been 30% c)the cost price of almirah is 10000 rs option 1)only a and b is required for answering the question 2)only b and c 3) only a and c 4) any two of three 5) none of these
profit earned by selling an article for rs 1060 is 20% more than the loss incurred by selling the article for rs 950 at what price should the article be sold to earn 20%%profit
I will give minimalistic answers....the way I think one should think in the exam....hope it helps.
@vivaciousgal said: hey puys....can anyone help me in solving these questions...1. A number is mistakenly divided by 5 instead of being multiplied by 5. Find the percentage change in the result due to mistake.?(a) 96% (b) 95% (c) 2400% (d) 200% (e) none
The new number is 1/25th of the original. Hence 100 would become 4, a decrease of 96%. So (a)
2. In a mixture of 80 litres of milk and water, 25% of the mixture is milk.How much water should be added to the mixture so that milk becomes 20% of the mixture.?(a) 20 litres (b) 15 litres (c) 25 litres (d) 24 litres (e) none
25% of 80 litres is 20 litres milk. After adding water, the same 20 litres is left which is 20% of new misture => new mixture is 100 litres => 20 litres added. So (a)
3. At an election, the candidate who got 56% of the votes cast won by 144 votes. Find the total number of the voters on the voting list if 80% people cast their vote and there were no invalid votes.?(a) 360 (b) 720 (c) 1800 (d) 1500 (e) 1600
(Question seems incomplete - would have to assume there are only 2 candidates) If so, winner gets 56% => loser gets 44% => winner wins by 12% which is 144 => total votes cast = 1200 which is 80% of total people on list => 1500 people on list. So (d)
4. Ram spends 20% of his monthly income on his house hold expenditure, 15% of the rest on books, 30% of the rest on clothes and saves the rest. On counting, he comes to know that he has finally saved Rs. 9520.Find his monthly income.?(a) 10000 (b) 15000 (c) 20000 (d) 12000 (e) none
Let's assume income 100. Household = 20. Left with 80. 15% of 80 = 12 on books. Left with 68. 30% of 68 = 20.4 on clothes. Left with 47.6 i.e 47.6% of original is 9520 => income is 20000. So (c)
5. In an examination, Mohit obtained 20% more than Sushant but 10% less than Rajesh. If the marks obtained by Sushant is 1080,find the percentage marks obtained by Rajesh if the full marks is 2000.? (a) 86.66% (b) 72% (c) 78.33% (d) 77.77% (e) none
If S were 1, M would be 1 x 120/100 = 1.2 and R would be 1.2 x 100/90 = 4/3. Hence if S is 1080, R is 1080 x 4/3 = 1440 which is 72% of 2000. So (b)
@[557270:HydRocker] how to calculate A:B:C when A:B, B:C, A:C are given ? please elaborate the method and rules of ratio and proportion if possble. thanks
@rkpushkar said:profit earned by selling an article for rs 1060 is 20% more than the loss incurred by selling the article for rs 950 at what price should the article be sold to earn 20%%profit
@rkpushkar said:WHAT WAS THE COST PRICE OF WATCH ? 1) THE SHOPKEEPER LABELLED THE PRICE OF THE WATCH 20% ABOVE THE COST PRICE 2) AFTER ALLOWING A DISCOUNT OF 15 % ON THE LABELLED PRICE , THE SHOPKEEPER CHARSES RUPEES 408 FOR THE WATCH 3)HAD THERE BEEN NO DISCOUNT , THE SHOPKEEPER WOULD HAVE EARNED 20% PROFIT . OPTINS :- A) 1 AND EITHER 2 OR 3 IS REQUIRED FOR ANSWER B) 2 AND EITHER 1OR 3 C) 3 AND EITHER 1 OR 2 D) 1 AND 2 ONLY E) ANY TWO OF THE THREE question from R S AGGRAWAL and pls provide solution in detail
l=List price c=CP d=discount on LP
First check 2) 408= l(1- 15/100)...Given ..we can find l easily
1)l=c(1.2)..given...CP ww can find easily with l given
3)(L-c)/c = 20/100......CP can easily be found with l given
@Aquanivi said: @HydRocker how to calculate A:B:C when A:B, B:C, A:C are given ? please elaborate the method and rules of ratio and proportion if possble. thanks
take the LCM of 2 B's and multiply A,B and B,C by required number to make B equal....
@scrabbler said: I will give minimalistic answers....the way I think one should think in the exam....hope it helps. The new number is 1/25th of the original. Hence 100 would become 4, a decrease of 96%. So (a) 25% of 80 litres is 20 litres milk. After adding water, the same 20 litres is left which is 20% of new misture => new mixture is 100 litres => 20 litres added. So (a) (Question seems incomplete - would have to assume there are only 2 candidates) If so, winner gets 56% => loser gets 44% => winner wins by 12% which is 144 => total votes cast = 1200 which is 80% of total people on list => 1500 people on list. So (d) Let's assume income 100. Household = 20. Left with 80. 15% of 80 = 12 on books. Left with 68. 30% of 68 = 20.4 on clothes. Left with 47.6 i.e 47.6% of original is 9520 => income is 20000. So (c) If S were 1, M would be 1 x 120/100 = 1.2 and R would be 1.2 x 100/90 = 4/3. Hence if S is 1080, R is 1080 x 4/3 = 1440 which is 72% of 2000. So (b) regards scrabbler
Ii am having problem in ques 3..can u plz elaborate some more.....
and in que 2 i didnt get that if the new mixture is 100 litres then why we will add only 20 litres of water as amount of milk is 20 litres..??
@vivaciousgal said: Ii am having problem in ques 3..can u plz elaborate some more.....
2 candidates A and B. Total votes cast, let us assume, are 100x (for convenience). A gets 56x, B 44x. A wins by 12 x. But we know A wins by 144. Hence x = 12 and total votes are 1200. Now we know that 80% of the people on the list (let that be y) voted. So 80y/100 = 1200. Hence y = 1500.
and in que 2 i didnt get that if the new mixture is 100 litres then why we will add only 20 litres of water as amount of milk is 20 litres..??
New mixture is 100, originally we started with 80. Hence 20 was added and it must all be water.
@scrabbler said: 2 candidates A and B. Total votes cast, let us assume, are 100x (for convenience). A gets 56x, B 44x. A wins by 12 x. But we know A wins by 144. Hence x = 12 and total votes are 1200. Now we know that 80% of the people on the list (let that be y) voted. So 80y/100 = 1200. Hence y = 1500. New mixture is 100, originally we started with 80. Hence 20 was added and it must all be water.
