Amanda works as a carpenter and as a blacksmith.
She earns $20 per hour as a carpenter and $25 dollar per hour as a blacksmith. Last week, Giselle worked both jobs for a total of 30 hours, and earned a total of $690dollar. How long did Giselle work as a carpenter last week, and how long did she work as a blacksmith?
Solve the following
A carpenter charged Rs. 2500 for making a bed. The cost of materials used is Rs. 1100 and the labour charge is Rs. 200 per hour. For how many hours did the carpenter work?