Question

Chloe swam 40 laps in the pool, but this was only 50% of her total swimming workout. How many more laps does she still have to do?

Answer 1

`40`

Explanation:

What we know:

`40` laps equals half her workout.

What we would like to know:

How many more laps she has to swim, we will call this `x`.
She has done `40` laps out of `x` amount this can be written as a fraction `40/x`. We are told that this is only half her workout, to find out the remaining laps we set up a proportion.

`40/x=1/2`

Cross multiply:

`x=80`

Now that we know the total amount of laps we can subtract this from the amount she has already completed.

`80-40=40`

She has `40` more laps to complete her workout.

Answer 2

She still has another `40` laps of the pool to do.

Explanation:

`50%` is the same as `1/2`

If she has completed `50%` of her workout `(1/2)`, then there is the same amount still left to do, (The other `50%`)

This means she still has another `40` laps of the pool to do.