Answer :
Answer:
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
The number of teachers are 42.
Given that,
- In a school, the ratio of the number of pupils to the number of teachers is 20:1.
- And, the number of pupils is 840.
Based on the above information, the calculation is as follows:
[tex]= 840 \div 20[/tex]
= 42
Therefore we can conclude that The number of teachers are 42.
Learn more: brainly.com/question/17429689