Aptitude - Percentage
21.
(31% of 260) x ? = 12896
Answer
31100 x 200 x x = 12896 ⇒ 806x = 128960
⇒ x = 128960860 = 160
Answer :
Option CExplanation :
31100 x 200 x x = 12896 ⇒ 806x = 128960
⇒ x = 128960860 = 160
22.
How is 34 expressed as a percentage ?
Answer
34 =
34 x 100 
% = 75%
Answer :
Option DExplanation :
34 =
34 x 100 % = 75% 23.
The price of petrol is increased by 25%. By how much percent should a car owner should reduce his consumption of petrol so that the expenditure on petrol would not increase ?
Answer
Shortcut Method :
Reduction % in consumption =
r(100 + r) x 100 
%
25125 x 100 % = 20%
Answer :
Option DExplanation :
Shortcut Method :
Reduction % in consumption =
r(100 + r) x 100 % 25125 x 100 % = 20% 24.
Two numbers are less than a third number by 30% and 37% respectively. How much percent is the second number less than the first ?
Answer
Let the 3rd number br 100. Then,
1st number = 70, 2nd number = 63
2nd number is less than 1st by = 770 x 100 % = 10%
Answer :
Option AExplanation :
Let the 3rd number br 100. Then,
1st number = 70, 2nd number = 63
2nd number is less than 1st by =
770 x 100 % = 10% 25.
In an election between two candidates, one got 55% of the total valid votes. 20% of the votes were invalid. If the total number of votes was 7500, the number of valid votes that the other candidate got, was
Answer
Valid votes = 80100 x 7500 = 6000
Valid votes for 1 candidate = 55100 x 6000 = 3300
Valid votes for another candidate = (6000 − 3300) = 2700
Answer :
Option AExplanation :
Valid votes =
80100 x 7500 = 6000Valid votes for 1 candidate =
55100 x 6000 = 3300Valid votes for another candidate = (6000 − 3300) = 2700
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