There are some people in a cinema. 3/5 of the people in the cinema are children
For the children in the cinema,
Number of girls:number of boys = 2:7
Their are 170 girls in the cinema
Work out the number of adults

Step-by-step explanation:

Given

Required

Determine the number of adults

First, we need to calculate the number of children

Given that:

Substitute 170 for Girls in

Convert to fraction

Cross Multiply

Divide both sides by 2

So, the number of children are:

Next, we calculate the number of people in the cinema.

Substitute 765 for Children

Make People the subject.

If 3/5 are children, then 2/5 are adults.

So: