Maths Questions Series #5
The difference between compound interest and simple interest on a sum for 2 year at 20% per annum is Rs 200. If the interest is compounded half yearly, then what is the difference (in Rs) between compound and simple interest for 15 year?
(A) 100
(B) 150
(C) 50
(D) 75
Correct Answer : C
The twice of sum of the ages of a father and his son is 8times the age of the son. If the average age of the father and the son is 28 years, what is father's age?
(A) 45
(B) 50
(C) 42
(D) 60
(E) 55
Correct Answer : C
The age of Shipra can be obtained by subtracting three times her age 3 years ago from the three times her age after 3 years. What will her age after 2 years?
(A) 20 years
(B) 22 years
(C) 18 years
(D) 24 years
(E) None of these
Correct Answer : A
A tap takes 36 hours extra to fill a tank due to leakage equivalent to half of its inflow. The inflow can fill the tank in how many hours?
(A) 36 hours
(B) 24 hours
(C) 30 hours
(D) 18 hours
Correct Answer : A
Pipe A can fill a tank in 6 hours. Pipe B can fill the same tank in 10 hours – pipe A, B, C together can fill the same tank in 12 hours. In how many hours pipe C can fill the tank alone?
(A) $$12{1\over2} $$ hours
(B) 4 hours
(C) 15 hours
(D) Not possible
Correct Answer : D
The smallest positive integer n for which 864 x n is a perfect cube, is:
(A) 3
(B) 4
(C) 1
(D) 2
Correct Answer : D
The smallest natural number, by which 3000 must be divided to make the quotient a perfect cube, is :
(A) 5
(B) 6
(C) 3
(D) 4
Correct Answer : C
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Vikram Singh
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