q: A can do a piece of work in 9 days. When he had worked for 2 days B joins him. If the complete work was finished in 8 days. In how many days B alone can finish the work?
Options:
(A) 18
(B) 77
(C) 66
(D) 54
(E) 12
a: OK... 8/9 + 6/x = 1
X = 54 days
The answer is (D).

q: What is the units digit of the expression 14^717^4?
Options:
(A) 0
(B) 3
(C) 4
(D) 8
(E) 6
a: OK... I think answer on this one should be D too. Since we know that 14^7>17^4, as Will said one should always check if the number is positive.
The answer is (D).

q: A money lender lends Rs.2000 for six months at 20% p.a. rate. It the interest is reckoned quarterly than find the amount given after time limit.
Options:
(A) 2205
(B) 3387
(C) 2882
(D) 2997
(E) 1278
a:
OK... A = 2000(21/20)2 = 2205
The answer is (A).