Giselle works as a carpenter and as a blacksmith. she earns $20\$20$20dollar sign, 20 per hour as a carpenter and $25\$25$25dollar sign, 25 per hour as a blacksmith. last week, giselle worked both jobs for a total of 30303030 hours, and earned a total of $690\$690$690dollar sign, 690. how long did giselle work as a carpenter last week, and how long did she work as a blacksmith?