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.