Question #12012

1 Answer
Feb 23, 2017

Answer:

#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#