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4 years ago

11

Josh can clean the math building on his campus in 2 hours. Ken takes 23 hours to clean the same building. If they work together

, how long will it take them to clean this building?

1 answer:

ANTONII [103]4 years ago

7 0

Answer:

1.84 hr.

Step-by-step explanation:

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$x+y=0 \\ x-y=10 \\\\
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y=-5\\\\
x-5=0\\
x=5\\\\
\boxed{(x,y)=(5,-5)}$

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