Competitive Exams : Quantitative Aptitude - Percentage (Set 8) | Concept of Maths

Question 1

If the radius of a right circular cylinder is increased by 20% and its height is decreased by 15%, what is the percentage change in its volume?

Accepted Answer

C) 22.4% increase

Answer

A) 5% increase

Answer

B) 12.4% increase

Answer

D) 20% increase

Question 2

In an election between two candidates, 10% of the voters did not cast their votes and 10% of the votes polled were found invalid. The successful candidate got 54% of the valid votes and won by a majority of 1620 votes. The total number of voters enrolled on the voters' list was:

Accepted Answer

B) 25,000

Answer

A) 22,500

Answer

C) 30,000

Answer

D) 32,400

Question 3

The income of A is 25% more than B's and the income of C is 65% less than the sum of the incomes of A and B. Income of C is what percent less than the income of A? (Correct to one decimal place)

Accepted Answer

D) 37.0%

Answer

A) 28.0%

Answer

B) 32.5%

Answer

C) 35.2%

Question 4

Due to a 25% increase in the price of sugar, a family reduces its consumption such that the expenditure on sugar is only 10% more than before. If 40 kg of sugar was consumed per month before the price rise, what is the new monthly consumption?

Accepted Answer

A) 35.2 kg

Answer

B) 32 kg

Answer

C) 36 kg

Answer

D) 38.4 kg

Question 5

The population of a town increased by 12.5% in the first year and decreased by 8% in the second year. If the current population is 51,750, what was the population two years ago?

Accepted Answer

B) 50,000

Answer

A) 48,000

Answer

C) 52,500

Answer

D) 45,000

Question 6

A student has to obtain 33% of the total marks to pass. He got 125 marks and failed by 40 marks. The maximum marks are:

Accepted Answer

A) 500

Answer

B) 600

Answer

C) 800

Answer

D) 1000

Question 7

If $x%$ of $y$ is 150 and $y%$ of $z$ is 300, then the relation between $x$ and $z$ is:

Accepted Answer

D) $z = 2x$

Answer

A) $z = x$

Answer

B) $z = 1.5x$

Answer

C) $x = 2z$

Question 8

A solution of salt and water contains 15% salt by weight. If 30 kg of water is evaporated, the concentration of salt becomes 20%. The original weight of the solution was:

Accepted Answer

C) 120 kg

Answer

A) 90 kg

Answer

B) 100 kg

Answer

D) 150 kg

Question 9

The price of an item is increased by 20%, then the new price is increased by 25%. If the final price is $Rs.\ 1500$, what was the original price?

Accepted Answer

B) $Rs.\ 1000$

Answer

A) $Rs.\ 900$

Answer

C) $Rs.\ 1100$

Answer

D) $Rs.\ 1200$

Question 10

In a class, 60% of the students are boys and the rest are girls. If 20% of the boys and 30% of the girls passed an exam, what percentage of the total students failed?

Accepted Answer

D) 76%

Answer

A) 24%

Answer

B) 48%

Answer

C) 70%