1000+ Mathematics Aptitude Questions and Answers - 1

Question: 1

Vipul decided to donate 5% of his salary. On ge day of donation he changed his mind and donated Rs. 1687.50. which was 75% of what he had decided earlier. How much is Vipul’s salary?

(A) Rs. 33,750

(B) Rs. 37,500

(C) Rs. 42,500

(D) Rs. 45,000

Ans: D

Vipul’s salary = $$1687.50 × {100}/{75} × {100}/{5}$$ = 45,000

Question: 2

In an examination there were 640 boys and 360 girls. 60% of boys and 80% of girls were successful. The percentage of failure was

(A) 20

(B) 30

(C) 32.80

(D) 40.5

Ans: C

Number of failure students = 40% of 640 + 20% of 360 = 256 + 72 = 328

% of failure = $${328} / {1000} × 100$$ = 32.80%.

Question: 3

The ratio of males and females in a city is 7:8 and the percentage of children among males and females is 25% and 20% respectively. If the number of adult females in the city is 156800. What is the total population?

(A) 171500

(B) 196000

(C) 245000

(D) 367500

Ans: D

Number of females = $$156800 × {100}/{80}$$ = 196000

∴ Number of males = $${7}/{8} × 196000$$ = 171500

∴ Total population = 196000 + 171500 = 367500.

Question: 4

The length of a rectangle is increased by 30% and the breadth by 20%. Then the perimeter of the rectangle will increase by what percent.

(A) 25%

(B) 26%

(C) 56%

(D) data inadequate

Ans: D

Require more information like ratio of the length of the rectangle to its breadth.

Question: 5

3.5 can be expressed in terms of percentage as

(A) 3.5%

(B) 350%

(C) 0.35%

(D) 35%

Ans: B

3.5 = $${350} / {100}$$ = 350%.

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