Sheila has a plan to save $45 a month for 18 months so that she has $810 to remodel her bathroom. After 13 months Sheila has saved $510. If the most Sheila can possibly save is $70 per month, which of the following statements is true?

After 13 months, Sheila has saved $510, so she still needs $810 − $510 = $300. There are 18 − 13 = 5 months left, so she must save $300 ÷ 5 = $60 per month. That is within her maximum of $70, so the true statement is that she must save $60 per month to reach her goal.

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