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A mural of Elvis Presley takes 56 days to complete by seven painters.  28 volunteers join the team after the first six days. How many more days are required before the painting of the king of rock ‘n’ roll is completed?

 Mar 30, 2020
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Assuming that all persons work at the same rate and do not interfere with each other:

 

7 painters each working 56 days take 7 x 56  =  392 painter-days

 

After 6 days, they have completed 7 x 6  =  42 painter-days.

 

Therefore, they still need  392 - 42  =  350 painter-days.

 

Add 28 volunteers, they now have 18 + 7  =  35 painters.

 

It will now take them  another 350 / 35  =  10 days.

 Mar 30, 2020

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