Question

Question #12012

Answer 1

`17 Hours`

Explanation:

To find how long it would take to earn `$391.` we first need to determine the rate at which Lenny is making money, usually in `$/h` as in $12.00/hour.

For Lenny 9 hours earned $207: `$/h = 207/9`

`$/h = 23` `@`Lenny is making good money for a HS student!

Then in order to find the hours to make `$391`, substitute for $ into the formula:

`$/h = 23`

`391/h = 23`

`h = 391/23`

`h = 17`

Check by estimation:

17 hours is one less than twice the original 9;

and money earned `$391` is `$23` less than twice the original `$207 xx 2 = 414`