math

posted by .

9 men build a house in a working 4 days .how many workmen ,working at the same rate willbe needed to build a house in 3 days

  • math -

    9 men do the job in 4 days
    That means 9 men can do 1/4 the job in 1 day.
    So, each man can do 1/36 of the job in a day.

    So, each man can do 3/36 = 1/12 the job in 3 days

    So, it will take 12 men to do the job in 3 days

    Or, more succinctly, since we want to take 3/4 as long, it will take 9/(3/4) = 12 men

  • math -

    18-10x<-22

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. algebra

    Here's the problem: It takes Stan 20 days to build a house by himself. When his wife, Brenda, joins him, it takes only 14 days. How long does it take Brenda to build a house on her own?
  2. math

    4 men built a wall in 11 days. How long would it take 1 man to build the wall working at the same rate?
  3. arithmetic

    Three men are working together can finish a house repair job in 10 days. How many days will 5 men working at the same rate finish the same job?
  4. college algebra

    the following rational function gives the number of days it would take two construction crews, working together, to frame a house that crew 1 (working alone)could complete in t days and crew 2 (working alone) could complete in t+3 …
  5. intermediate Algebra

    Mio can build a large shed in 7 days less then yuuko can. If they build it together it would take them 12 days. How long would it take each of them working alone?
  6. ALGEBRA

    Jose can paint a house in 10 days and peter can paint the same house in 12 days. How long will it take to paint the house if both men work?
  7. Algebra

    It takes 15 men working steadily 4 days to dig the foundation for a new apartment. How many days would it have taken 25 men working at the same rate to dig the foundation?
  8. Math

    Johnson's house was $112.00 per square meter to build. The house is 12 meters wide and 18 meters long. How much did it cost to build the house?
  9. algebra 2

    A new development has 105 houses, all same size. if Evan can paint a house in 4 days and Joel can paint a house in 3 days, how many weeks will it take them working together to paint all 105?
  10. maths

    8 men can build a house in 6 months how long will it take 12 men tovdo the same job working at the same rate?

More Similar Questions