In 10 seconds, Sharon can run 71 yards, Mary can run 83 yards, and Nancy can run 18 yards more than Sharon. How many more yards can Nancy run than Mary in 10 seconds?



This is a two-step problem. First find out how many yards Nancy runs. Then how many more yards she runs than Mary. Since Nancy runs 18 more yards than Sharon and Sharon runs 71 yards in 10 seconds, Nancy runs 71 + 18 = 89 yards in 10 seconds. Mary runs 83 yards and Nancy runs 89 yards in 10 seconds. So Nancy runs 89 – 83 = 6 yards more than Mary in 10 seconds.

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