Question 735589
It takes 12 people to complete a project in 36 days
Find how many man-days to complete the job
12 * 36 = 432 man-days to complete the job
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 how many people is needed to complete the project in 24 days
let m = no. of men require so complete in 24 days
24m = 432
m = 432/24
m = 18 men to do the job 
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You can also solve this with an inverse ratio equation
{{{m/12}}} = {{{36/24}}}
24m = 12*36
24m = 432
m = 432/24