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29 September, 20:11

In a school, the ratio of the number of pupils to the number of teachers is 20:1. If the number of pupils is 840, how many teachers are there?

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  1. 29 September, 23:58
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    42

    Step-by-step explanation:

    840 pupils is represented by 20 parts of the ratio.

    Divide number of pupils by 20 to find the value of one part of the ratio.

    840 : 20 = 42 ← value of 1 part of the ratio, thus

    number of teachers = 42
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