question:Ravi can do a piece of work in 30 days while Prakash can do it in 40 days. In how many days will they finish it together?
Options:
(A) 17 1/7 days
(B) 27 1/7 days
(C) 23 2/7 days
(D) 16 4/11 days
(E) none of these
answer:(A)
Stream of consciousness:1/30 + 1/40 = 7/120
120/7 = 17 1/7 days

question:Four of the five parts numbered (a),(b),(c),(d) and (e) in the following equation are exactly equal. Which of the parts is not equal to the other four? The number of that part is the answer.
Options:
(A) (a b) 2 + 4ab
(B) a(a + b) + b(a + b)
(C) (a2 b2) + 2b(b + a)
(D) (a b) b + (a + b) 2b
(E) (a + b) 2 2a(a b) + a(2a 2b)
answer:(D)
Stream of consciousness:The other parts are equal to (a + b)2.

question:The purchase price of an article is $48. In order to include 10% of cost for overhead and to provide $12 of net profit, the markup should be
Options:
(A) 15%
(B) 25%
(C) 35%
(D) 40%
(E) 45%
answer:
(C)
Stream of consciousness:Cost price of article = 48$
% of overhead cost = 10
Net profit = 12 $
We need to calculate % markup
Net profit as % of cost price = (12/48)*100 = 25%
Total markup should be = 25 + 10 = 35%