Question

Jack is trying to make extra money on his summer vacation from school. He works two different jobs, earning $9 per hour washing cars and $6 per hour walking dogs. How much money would Jack earn in a week in which he worked 5 hours washing cars and 2 hours walking dogs? How much money would Jack earn in a week in which he worked w w hours washing cars and d d hours walking dogs? 5 hours washing cars and 2 hours walking dogs: w w hours washing cars and d d hours walking dogs:

Answer 1

$57

`9w+6d`

Explanation:

Given that:

Earnings per hour for washing cars = $9

Earnings per hour for walking dogs = $6

Number of hours for which car washing is done =
`w`

Number of hours taken for walking dogs =
`d`

Earnings for
`w` hours for washing cars = Per hour earnings multiplied by number of hours = $9
`w`

Earnings for
`d` hours for walking dogs = Per hour earnings multiplied by number of hours = $6
`d`

Total earnings by both = $(
`9w+6d`)

Now, given that

Number of hours spent washing cars = 5 hours

Number of hours spent walking dogs = 2 hours

Therefore, total earnings by both = 9
`*` 5 + 6
`*` 2 = $57