Two runners are saving money to attend a marathon. The first runner has $112 in savings, received a $45 gift from a friend, and will save $25 each month. The second runner has $50 in savings and will save $60 each month.

After m months, the first runner will have $112 in savings, plus the $45 gift, plus $25 for each month: 112 + 45 + 25m. The second runner will have $50 plus $60 for each month: 50 + 60m. Choice D, 112 + 25m + 45 = 50 + 60m, sets those amounts equal to find when their savings match.

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