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photoshop1234 [79]
3 years ago
6

You are having your car repaired by a mechanic. You paid $200 for the new parts, and it cost $50 per hour for the labor. Your to

tal cost was $475. How many hours of labor did you pay for? This word problem needs to be modeled with an inequality and solved. Can you please help me?
Mathematics
1 answer:
ZanzabumX [31]3 years ago
3 0
9 and a half hours. That is kind of a long time
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Answer:

13 l of 15%, 13 l of 25%, 26 l of 70%

Step-by-step explanation:

solutions:

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final solution:

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This includes 0.45*52l= 23.4 l acid

Let's assume:

  • amount of 15% solution= x
  • amount of 25% solution= y
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  • and we have z=2y

so there are 2 equation:

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or

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  • 0.15x+0.25y+1.4y=23.4
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  • 0.15*(52-3y)+1.65y=23.4
  • 7.8-0.45y+1.65y=23.4
  • 1.2y=23.4-7.8
  • 1.2y= 15.6
  • y=15.6/1.2
  • y= 13 l

--------

  • x= 52- 3*13= 13 l
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Step-by-step explanation:

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