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Demetria drove a total of 120 miles this week. She drove 15 miles more this week than she drove last week. What is x, the number of miles Demetria drove last week?

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Marianpascualviz
225 miles ................

Shinalcantaraviz
Let 'x' be the number of miles Demetria drove last week
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since she drove 15 miles more this week than last week and that she drove 120miles this week then,
120 = x + 15
120 - 15 = x 
105 = x
x = 105 miles
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Therefore she drove 105 miles last week.