SOLUTION: 10 people can paint a building in 5 days. If each person paints as quickly as the others then how much of the building could 7 people paint in 5 days?

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Question 1141600:


10 people can paint a building in 5 days. If each person paints as quickly as the others then how much of the building could 7 people paint in 5 days?

Found 3 solutions by ikleyn, josgarithmetic, greenestamps:
Answer by ikleyn(52914) About Me  (Show Source):
You can put this solution on YOUR website!
.

ANSWER.   %287%2A5%29%2F%2810%2A5%29 = 7%2F10 of the building = 0.7 of the building.



Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
r, the painting rate of any one person

10r%2A5=1-----------painting ONE building

r=1%2F50-----------painting rate for ONE person; fifty days for one person to paint the building if paint alone.


How much of building if 7 persons for 5 days?
7%2A%281%2F50%29%2A5=Q
Q=7%280.1%29

highlight%28Q=0.7%29

Answer by greenestamps(13215) About Me  (Show Source):
You can put this solution on YOUR website!


Solve using common sense.

The number of days is the same in both cases; so 7/10 as many workers means 7/10 as much work.

ANSWER: 7/10 of the building gets painted in 7 days.