Answer: 24 teachers
Explanation:
The ratio of children to teacher is 35 : 6 or
. To find how many teachers is needed for 140 children, you would need to use the following equation:
.
To solve this, you would need to cross multiply.

35 * x = (140) * (6)
35x = 840
Divide both sides by 35
x = 24
Another way to do it:

Multiply x to both sides
x = 24 Divide both sides by 35