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Grade 7 math · P.2 · Equation word problems

Word problems: a phone battery drains

Write an equation for the situation, then solve it.

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  1. A phone is charged to 50%. It loses 5% each hour. After how many hours is it at 35%?

    Answer: 3

  2. A phone is charged to 33%. It loses 2% each hour. After how many hours is it at 21%?

    Answer: 6

  3. A phone is charged to 48%. It loses 2% each hour. After how many hours is it at 36%?

    Answer: 6

Tip: Write an equation for the situation, then solve it.

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