if 20 men can build a house in 30 days how many men can do it in 24 days
To do the same job in 1/4 the time, it will take four times the labor force. 20 * 4 = 80 men. ■
4 men are required
6 men took 20 days so it is 120 man-days worth of work. 4 men will take 120/4 = 30 days to do the work.
a man is building a fence for 3 days if 3 men build the fence, how many days can they build it? solution: 1x3=3/3= 1the answer is 1!===There's no such commonly recognised thing as 'indirect proportion'. If you mean Inverse Proportion, this is when one quantity decreases as another increases by the same factor.As an example, the time it takes to run 100 m is inversely proportional to the speed you run at - if you double your speed, it takes you half as long.Many maths problems run along the lines of "If it takes three men four days to build a wall, how long will it take five men to build the same wall?". This is inverse proportion. As you increase the number of men by a factor of 5/3, you decrease the time taken by a factor of 5/3, so the answer here is 2.4 days.I hope that helps!
15 days
Four men can paint eight houses in two days.How many days does it take a man to paint a house ?Note: This problem does not equal 1, but its solution does.
30 days.
75 / 5 = 15 days for 12 men to build one house. 15x12 = 180 days for 1 man to build 1 house. 180 x 7 = 1260 days for 1 man to build 7 houses. 1260 / 20 = 61 days for 20 men to build 7 houses.
35 days
1 wall = 5 men X 8 days = 40 man days 40 man days / 3 men = (40/3) days = 13 1/3 days
4 days
Suppose, the dimension of wall built by one man per day equals to W, and everyone has the same workload. Then, the dimension of wall built by 18 men in 12 days can be calculated as, 18*12*W=216W. We assume the number of men employed to build a similar wall in 9 days is M. So, 9MW=216W, rearrange the equation, we get M=24.
10
Building 5 houses takes 12 x 75 ie 900 man-days. 20 men will thus take 900/20 ie 45 days.
2.5 men.
It takes 100 man-days, so three men would take 33 and a third days and 8 men 12½ days. Working together the 3 men and 8 men would take 100/11 or 9 and a ninth days
it took a couple thousand men to build the step pyramid.
14,000,000,000 men at the least.