1. If 30 men do part of a job in 2 days, how many days will 21 men take to do the job?
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21 mens will take 20 days to do the job
30 men can do 1/7 part of a job in 2 days
30 men can do 7/7 = 1 job in 2 x 7 = 14 days
1 man can do 1 job in 14 x 30 = 420 days
21 men can do 1 job in 420/21 = 20 days
Hopr this helps☺
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