Giselle works as a carpenter and as a blacksmith. she earns \$20$20dollar sign, 20 per hour as a carpenter and \$25$25dollar sign, 25 per hour as a blacksmith. last week, giselle worked both jobs for a total of 303030 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?

Step-by-step explanation:

let x is total hours of carpenter and y is total hours of blacksmith

total hours --

x + y = 30 - equation 1

total earnings -

20x +25y = 690 - equation 2

from equation 1 ,

x = 30 - y

20(30-y) +25y =690

600 - 20y +25y =690

5y =90

y=18

x=30-18 =12

carpenter= 12 blacksmith=18

Giselle worked as a carpenter for  12  hours and as a blacksmith for  18  hours last week.

Step-by-step explanation:

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