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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