-
franciskyle
- Senior | Next Rank: 100 Posts
- Posts: 32
- Joined: Wed Mar 11, 2009 9:56 pm
- Location: Whitler, BC, Canada
Question:
If 4 men working at the same rate can do 2/3 of a job in 40 minutes, how many minutes would it take 1 man working at this rate to do 2/5 of the job?
Answers:
80, 88, 92, 96, 112
How would you tackle this problem?
Below is how I solved it, but I feel like there is an easier way to do this problem. Any suggestions? How would you rate this problems difficulty?
WARNING: SPOILER BELOW:
2/3 Job / 4 Men = (2/3)/4 = 1/6... therefore each man does 1/6 of the job in 40 minutes.
1/6 Job / 40 minutes = (1/6)/40 = 1/240... therefore each man does 1/240 of the job per minute
Using Distance (Work) = Rate * Time
2/5 = 1/240 * time
2/5 * 240 = time
48 * 2 = 96
If 4 men working at the same rate can do 2/3 of a job in 40 minutes, how many minutes would it take 1 man working at this rate to do 2/5 of the job?
Answers:
80, 88, 92, 96, 112
How would you tackle this problem?
Below is how I solved it, but I feel like there is an easier way to do this problem. Any suggestions? How would you rate this problems difficulty?
WARNING: SPOILER BELOW:
2/3 Job / 4 Men = (2/3)/4 = 1/6... therefore each man does 1/6 of the job in 40 minutes.
1/6 Job / 40 minutes = (1/6)/40 = 1/240... therefore each man does 1/240 of the job per minute
Using Distance (Work) = Rate * Time
2/5 = 1/240 * time
2/5 * 240 = time
48 * 2 = 96
k. Francis
