Question

Dan tan 31 miles more than Jennifer last week. Dan ran 138 miles. How many miles did Jennifer run?

Answer 1

Solution:
138-31= 107 miles

Answer 2

Let x represent the total miles that Jennifer runs
Dan rans 31 miles more than Jennifer last week. Dan ran 138 miles, means that
x+31=138
Next, solve it
x+31=138
Subtract 31 to each side
x+31-31=138-31
x=107 miles. As a result, Jennifer runs 107 miles in total. Hope it help!