If 1/2 of the air in a tank is removed with each stroke of a vacuum pump, what fraction of the original amount of air has been removed after 2 strokes ?\nOptions:\n(A) 3/4\n(B) 7/8\n(C) 1/4\n(D) 1/8\n(E) 1/16 Stream of consciousness:
User
Left After 1st stroke = 1/2\nLeft After 2nd stroke = 1/2 * 1/2 = 1/4\nSo removed = 1- 1/4 = 3/4
Thus, the answer is (A).
Assistant