If 14 days pass, how many minutes fast will a watch gain if it gains 2 minutes per day?

If 14 days pass, how many minutes fast will a watch gain if it gains 2 minutes per day?

• A. 14
• B. 56
• C. 28
• D. 42

Answer: (C)

This question tests multiplying the rate by the time to find the total gain. If the watch gains 2 minutes each day, then over 14 days the total gain is 2 × 14 = 28 minutes. So the watch will be 28 minutes fast. If you mix up the numbers, you’d get different results: 14 minutes would come from 7 days at 2 minutes per day (or 14 days at 1 minute per day), 56 minutes would come from 28 days at 2 minutes per day, and 42 minutes would come from 14 days at 3 minutes per day.

This question tests multiplying the rate by the time to find the total gain. If the watch gains 2 minutes each day, then over 14 days the total gain is 2 × 14 = 28 minutes. So the watch will be 28 minutes fast.

If you mix up the numbers, you’d get different results: 14 minutes would come from 7 days at 2 minutes per day (or 14 days at 1 minute per day), 56 minutes would come from 28 days at 2 minutes per day, and 42 minutes would come from 14 days at 3 minutes per day.