Question: The average of five numbers is 41. The average of first two numbers is 32 and the average of last two numbers is 38. What is the middle number?
Options:
(A) 59
(B) 64
(C) 61
(D) 72
(E) 65
Answer: The total of five numbers = 5X41 = 205
The total of first 2 and last 2 numbers is = 2 X 32+2 X 38 = 140
So, the middle number is (205 - 140 ) = 65
The answer is (E).

Question: If one type of tobacco costs Re.1/- per kg and other type costs Rs. 5/- per kg. What quantity of first type and second type are mixed so that 100 kg of mixture costs Rs. 100/-?
Options:
(A) 50 kg
(B) 100 kg
(C) 150 kg
(D) 200 kg
(E) 250 kg
Answer: 100 kg of first type.
The answer is (B).

Question: A train running at the speed of 60 km/hr crosses a pole in 6 sec. What is the length of the train?
Options:
(A) 120 m
(B) 100 m
(C) 324 m
(D) Cannot be determined
(E) None of these
Answer: Speed = 60* 5/18 = 50/3 m/sec
Length of the train = speed * time = 50/3 * 6 = 100 m
The answer is (B).

Question: Twenty percent of Country Y's yearly exports come from fruit exports. One-fourth of all fruit exports from Country Y are orange exports. If country Y generates $40 million from its orange exports, how much money does it generate from its yearly total of exports?
Options:
(A) $21.25m
(B) $800m
(C) $106.25m
(D) $127.5m
(E) $153m
Answer:
20/100*1/4*(total) = 40
1/20*(total) = 40
(total) = 40*20 = 800
The answer is (B).