Giselle works as a carpenter and as a blacksmith.
She earns $20dollar sign, 20 per hour as a carpenter and $25dollar sign, 25 per hour as a blacksmith. Last week, Giselle worked both jobs for a total of
30 hours, and earned a total of \$690$690dollar sign, 690.
How long did Giselle work as a carpenter last week, and how long did she work as a blacksmith?