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15 January, 17:48

If 20 volunteers can wash 100 cars in 2.5 hours, find the constant of variation and find out how many cars 30 volunteers can wash in 3 hours?

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  1. 15 January, 18:04
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    20 volunteers ... 100 cars ... 2,5 h

    1 volunteer ... 100 cars ... 2,5*20=50 h

    1 volunteer ... 100:50=2 cars ... 1h

    1 volunteer ... 2*3=6 cars ... 3h

    30 volunteers ... 6*30=180 cars ... 3h

    Answer: 180 cars
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