The ages of Rahul and Madhan differ by 16 years. Six years ago, Madhan's age was thrice as that of Rahul's,find their present ages
Options:
(A) 14 years, 30 years
(B) 12 years, 28 years
(C) 16 years, 34 years
(D) 18 years, 38 years
(E) none of these

Let Rahul's age = x years
So, Madhan's age = ( x + 16 )years
Also, 3(x - 6) = x + 16 - 6 or, x = 14
Rahul's age = 14 years
And, Madhan's age 14 + 16 = 30 years So the answer is: (A).

A man buys two articles for Rs.1980 each and he gains 10% on the first and loses 10% on the next. Find his total gain or loss percent?
Options:
(A) 9
(B) 8
(C) 7
(D) 6
(E) 5

(30*30)/100 = 9%loss So the answer is: (A).

Right triangle ABC is the base of the prism in the figure above. If AB=AC=2 and the height of the prism is 3, what is the volume of the prism?
Options:
(A) 1
(B) 3/2
(C) 2
(D) 3
(E) 6

Volume of prism = Area of base * height = 1/2* (square root of 2) * (square root of 2)*3 = 3 So the answer is: (D).

Every year an amount increases by 1/8th of itself. How much will it be after two years if its present value is Rs.64000?
Options:
(A) 81000
(B) 81007
(C) 81008
(D) 81066
(E) 81022
64000* 9/8 * 9/8 = 81000 So the answer is: (A).