Nora swims several times a week in a lake near her house. This past summer, the average water temperature was 24 °C, which is 20% warmer than it was last summer. What was last summer's average water temperature?

Solution

Solution

Amount before addition : 20

Solution steps

Translate the problem into an equation:

24 = x + 0.2 x

24 = x + 0.2 x : x = 20

Amount before addition : 20

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