In what proportions should coffee of type A, type B and type C be mixed to get coffee which costs $8 for every 100 ounces? 1) The ratio in which coffee of type A and type C are mixed is 2:1. 2) Coffee of type A, type B and type C cost $4, $10 and $6 respectively for 100 ounces. Don't have the OA. I...

Percentage word problem

On a certain road 10 percent of the motorists exceed the posted speed limit and receive speeding tickets, but 20 percent of the motorists who exceed the posted speed limit do not receive speeding tickets. What percent of the motorists on the road exceed the posted speed limit? (A) 10 1/2 % (B) 12 1/...

Geometry - television screens

The size of a television screen is given as the length of the screen’s diagonal. If the screens were flat, then the area of a square 21-inch screen would be how many square inches greater than the area of a square 19-inch screen?

(A) 2
(B) 4
(C) 16
(D) 38
(E) 40

seating arrangements question - fastest way to solve

The president of a country and 4 other dignitaries are scheduled to sit in a row on 5 chairs. If the president must sit in the center chair, how many different seating arrangements are possible for the 5 people? (A) 4 (B) 5 (C) 20 (D) 24 (E) 120 What is the fastest way to solve this question. Would ...

Thanks shankar.ashwin, that's what I suspected. Does this happen a lot in the GMAT paper tests?

Which statement is true

If n and k are integers whose product is 400, which of the following statements must be true? (A) n + k > 0 (B) n ≠ k (C) Either n or k is a multiple of 10. (D) If n is even, then k is odd. (E)If n is odd, then k is even. My test prep book shows me the answer is ( E ), but isn't that the same as (...