Question: A and B can do a work in 18 days, B and C in 30 days and C and A in 36 days. In how many days will the work be completed, if all three of them work together?
Options:
(A) 360/13 days
(B) 350/13 days
(C) 160/13 days
(D) 260/13 days
(E) 960/13 days
Answer: One day work of A and B = 1/18
One day work of B and C = 1/30
One day work of C and A = 1/36
2(A + B + C) = 1/18 + 1/30 + 1/36
2(A + B + C) = 21/180
(A + B + C) = 13/360
Number of days required = 360/13 days.
The answer is (A).

Question: Four of the following five parts (a), (b), (c), (d) and (e) are exactly equal. The number of the part which is not equal to the other four parts is your answer.
Options:
(A) 30 14 7 5
(B) 10 3 100 7
(C) 53600
(D) 450 50 50 5 30
(E) 10 3 + 120 2
Answer: Other parts are equal to 300.
The answer is (E).

Question: 7528:5306::4673:?
Options:
(A) 2351
(B) 2451
(C) 2551
(D) 2651
(E) 2751
Answer: As there is a difference of 2222. 7528-2222 = 5306. so 4673-2222 = 2451
The answer is (B).

Question: For integers U and V, when U is divided by V, the remainder is even. Which of the following must be true?
Options:
(A) U is odd
(B) At least one of U and V is odd
(C) The sum U + V is odd
(D) U and V share no common factors other than 1
(E) UV is odd.
Answer:
At least one of U and V is odd
The answer is (B).