how to solve the following?
2008-08-28 3:04 pm
Ten people can paint 60 houses in 120 days, so five people can paint 30 houses in how many days?
回答 (7)
2008-08-28 3:39 pm
✔ 最佳答案
10 people : 60 houses : 120 days= 1 person : 6 houses : 12 days
5(1 person : 6 houses : 12 days)
= 5 people : 30 houses : 60 days
∴ 5 people can paint 30 houses in 60 days.
2008-08-28 10:09 pm
120 days
2008-08-28 10:20 pm
Set this up as an equation. You have how many man-days per house:
10people * 120days/60 houses = 20 man-days per house
so... 5 people * x days/30 houses =20 man-days per house
Solve for x to get 120 days
10people * 120days/60 houses = 20 man-days per house
so... 5 people * x days/30 houses =20 man-days per house
Solve for x to get 120 days
2008-08-28 10:18 pm
Ten people can paint 60 houses in 120 days
Ten people can paint 30 houses in 60 days
Five people can paint 30 houses in 120 days
Ten people can paint 30 houses in 60 days
Five people can paint 30 houses in 120 days
2008-08-28 10:13 pm
Using ratio and proportion:
10:60: 120 = 5: 30: x
10/60 (120) = 5/30 (x)
1200/60 = 5x/30
60(5x) = 1200 (30)
300x = 36000
x = 120 days
10:60: 120 = 5: 30: x
10/60 (120) = 5/30 (x)
1200/60 = 5x/30
60(5x) = 1200 (30)
300x = 36000
x = 120 days
2008-08-28 10:13 pm
You've reduced the work force by half, but you ALSO reduced the work load by half, so the rate stays the same. 120 days.
2008-08-28 10:12 pm
Ten people can paint 60 houses in 120 days
so 10 people can do 1 house every 2 days.
so 1 person can do 1 house every 20 days
1 person and 30 houses would be 20*30 = 600 days
with 5 people that becomes 600/5 or 120 days.
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so 10 people can do 1 house every 2 days.
so 1 person can do 1 house every 20 days
1 person and 30 houses would be 20*30 = 600 days
with 5 people that becomes 600/5 or 120 days.
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