Giselle works as a carpenter and as a blacksmith. She earns $20/$20 $20 dollar sign, 20 per hour as a carpenter and $25/$25 $25 dollar sign, 25 per hour as a blacksmith. Last week, Giselle worked both jobs for a total of 3030 30 30 hours, and earned a total of $690/$690 $690 dollar sign, 690. How long did Giselle work as a carpenter last week, and how long did she work as a blacksmith? Giselle worked as a carpenter for hours and as a blacksmith for hours last week.

Question

Kasey Murray

Mathematics

10 May, 01:07

Giselle works as a carpenter and as a blacksmith. She earns $20/$20 $20 dollar sign, 20 per hour as a carpenter and $25/$25 $25 dollar sign, 25 per hour as a blacksmith. Last week, Giselle worked both jobs for a total of 3030 30 30 hours, and earned a total of $690/$690 $690 dollar sign, 690. How long did Giselle work as a carpenter last week, and how long did she work as a blacksmith? Giselle worked as a carpenter for hours and as a blacksmith for hours last week.

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Answers (1)

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Skylar Blanchard · Answer 1

C = # of carpenter hrs, b = # of blacksmith hrs

c + b = 30 ... c = 30 - b

20c + 25b = 690

20 (30 - b) + 25b = 690

600 - 20b + 25b = 690

-20b + 25b = 690 - 600

5b = 90

b = 90/5

b = 18 < = = hrs worked as blacksmith

c + b = 30

c + 18 = 30

c = 30 - 18

c = 12 < = = hrs worked as carpenter