George has made a vow to jog for an average of one hour daily five days a week. He cut his workout short on Wednesday by 40 minutes but was able to make up 20 minutes on Thursday and 13 minutes on Friday. How many minutes of jogging did George lose for the week?
a. 20 minutes
b. 13 minutes
c. 7 minutes
d. 3 minutes
Answer: c. 7 minutes
This is a three-step problem involving multiplication, subtraction, and addition. First
find out how many fewer minutes George
jogged this week than usual: 5 hours × 60 minutes = 300 minutes − 40 minutes missed = 260
minutes jogged. Now add back the number of
minutes George was able to make up: 260
minutes + 20 + 13 minutes = 293 minutes.
Now subtract again: 300 minutes − 293 = 7
minutes jogging time lost.
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