THE CORRECT ANSWER IS (D). THE KEY TO HANDLING THIS QUESTION IS TO...
31. The correct answer is (D). The key to handling this question is to convert ratios to
fractional parts that add up to 1. The ratio of X’s rate to Y’s rate is 3 to 1, and the ratio
of Y’s rate to Z’s rate is 1 to 2. You can express the ratio among all three as 3:1:2 (X:Y:Z).
Accordingly, Y’s production accounts for
1
6
of the total widgets that all three machines
can produce per day. Given that Y can produce 35 widgets per day, all three machines
can produce (35)(6)
5
210 widgets per day.