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TEA [102]
2 years ago
11

You can paint a room in 8 hours. Working together, you and a friend could paint the same room in just 5 hours. How long would it

take your friend to paint the room alone.
Mathematics
1 answer:
Degger [83]2 years ago
5 0

Answer:

friend alone could do it in 13 hours and 1/3

Step-by-step explanation:

Your rate = room/8

friends rate = room/x

combined rate = room/8 + room/x

= room(x+8)/(8x)

then

5 = room / [room(x+8)/(8x)]

5 = 8x/(x+8)

8x = 5x + 40

3x = 40

x = 40/3 = 13 1/3

friend alone could do it in 13 hours and 1/3

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324-172=2w

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w=152/2

w=76 cm

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