Question

An aerobics instructor burns 400 calories in one hour. How many hours would the instructor have to do aerobics to burn 560 calories?

Answer 1

The instructor will have to do aerobics for `color(blue)(1.4` hours in order to burn `560` calories.

Explanation:

The data can be expressed as follows:

`400` calories = `color(blue)(1` hour

`560` calories `= color(blue)(x` hours

We cross multiply the above equations in order to find `x:`

`color(blue)(x) = ( 560 xx color(blue)(1)) / 400`

`color(blue)(x) =1.4` hours