Question

Ok so, Adam had 91 dollars. If he spent 21 dollars on new books, what is the ratio of money he still has, to money he's spent. The answer is 10:3, but I need a show your work example from somebody! Please help!

Answer 1

`(10)/(3)`

Explanation:

Let

x ----> the money Adam still has

y ---> the money Adam spent

r ---> the ratio of money he still has, to money he's spent.

`r=(x)/(y)`

we know that

The money Adam still has is the same as the money he originally had minus the money he spent.

so

`x=\$91-\$21=\$70`

we have

`y=\$21`

Find the ratio

`r=(70)/(21)`

Simplify

Divide by 7 both numerator and denominator

`r=(10)/(3)`