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?

The number of teachers are 42.

Given that,

Based on the above information, the calculation is as follows:

= 42

Therefore we can conclude that The number of teachers are 42.

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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

360 different combinations

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step-by-step explanation: