Homework Help: Math

Posted by Will on Tuesday, June 2, 2009 at 11:22pm.

If it takes 4 people 20 days to build a house, how long does it take 6 people. I know the answer is 15 days, but for the life of me I can't figure out the formula for it.

Math - MathMate, Tuesday, June 2, 2009 at 11:26pm
20 days are required for 4 people to build a house. So it takes 4*20=80 man-days.
If we have 6 people, then it should take 80/6=13.3 days to finish the house.

Answer this Question

Related Questions

algebra - Here's the problem: It takes Stan 20 days to build a house by ...
math - it takes 7 men 10 days to build a garage.Halfway through building the ...
Algebra - six people can paint a house in 3 days, how long it would take two ...
Algebra - six people can paint a house in 3 days, how long it would take two ...
Math - Hers is another one: 3 people requires 3 weeks and 2 days to do a job. ...
math - 9 men build a house in a working 4 days .how many workmen ,working at the...
MATH - It takes Hank twice as long ot build one table as it takes to build one ...
Math - Bryan and Kim are painting a house. Working together they can paint a ...
Algebra - It takes matt 9 hrs longer to build a wall than it takes chris. ...
Math - A work crew of 3 people requires 3 weeks and 2 days to do a certain job. ...

For Further Reading

First Name:
School Subject:
Answer: