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?

Question

Anabella French

Mathematics

30 October, 00:43

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?

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Answers (1)

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Itzel · Answer 1

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