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ElenaW [278]
3 years ago
13

I need an answer for this lolz

Mathematics
1 answer:
Afina-wow [57]3 years ago
8 0

Answer:

She worked 12 hours as a carpenter and 18 hours as a blacksmith

Step-by-step explanation:

You can solve this problem using a system of equations:

where c represents hours worked as a carpenter, and b represents hours worked as a blacksmith;

c + b = 30

20c + 25b = 690

To solve this system, you can multiply the first equation by 20 and subtract it from the second to isolate b:

  20c + 25b = 690

<u>- 20c + 20b = 600</u>

              5b  = 90

Now, you can solve for b:

5b = 90

b = 18 (divide both sides by 5)

Now that you know b, you can input it into the first equation to find c:

b + c = 30, where b = 18;

18 + c = 30 (replace b in the equation with 18 because of transitive property of equality)

c = 12 (subtract 18 from both sides of the equation))

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