Question

Giselle earns $20 per hour as a carpenter and $25 per hour as a blacksmith. Last week Giselle worked both jobs for a total of 30 hours, and earned a total of $690. How many hours did she worked as a carpenter and as a blacksmith?

Answer 1

Giselle worked as a carpenter for 12 hours and 18 hours as a blacksmith

Explanation:

Let x be the number of hours Giselle worked as a carpenter
Then `30-x` is the number of hours Giselle worked as a blacksmith

`20x+25(30-x)=690`
`20x+750-25x=690`
`60=5x`
`x=12`

Therefore, Giselle worked as a carpenter for 12 hours and 18 hours as a blacksmith