Question

For the question below, think carefully about what you divide 80 by to calculate the value of one part.

In a housing estate the direct proportion of flats to houses is 2:5. If there are 80 flats, how many houses are there?

Answer 1

200 houses

Explanation:

Flat: 2 parts = 80 flats
1 part => 80 : 2 = 40 flats
Houses: 5 parts = 40 x 5 = 200 houses

Answer 2

200

Explanation:

`(2)/(5)` =
`(80)/(x)`

2 x 40 = 80, so

5 x 40 = 200