q: Which one of the following is a prime number?
Options:
(A) 55
(B) 2
(C) 74
(D) 25
(E) 21
a: OK... 2 is divisible by 1 and itself So, it is a prime number.
The answer is (B).

q: If 4 men can paint 60 m long wall in 3 days, then 5 men can paint 50 m long wall in
Options:
(A) 3days
(B) 2days
(C) 5days
(D) 6days
(E) 1day
a: OK... The length of wall painted by one man in one day = 60 / 4 3 = 5 m
No. of days required to paint 50 m wall by 5 men = 50/ 5 5 = 2 day.
The answer is (B).

q: In what time a sum of money double itself at 3% per annum simple interest?
Options:
(A) 33 1/7%
(B) 33 1/3%
(C) 33 1/2%
(D) 33 7/3%
(E) 33 5/3%
a:
OK... P = (P*3*R)/100
R = 33 1/3%
The answer is (B).