At construction job for a house, 15 painters were tasked with painting the interior. these painters made up 75% of the painting crew, so how many painters in all worked on this job? round your answer to the nearest whole number if necessary.

There are 20 painters in all who worked on this job.

Given:
interior painters = 15 painters
percentage of interior painter = 75% of painting crew

15 is a part of a whole ; 75% is the equivalent of the part in a whole.

To get the whole which is the total number of painters in the painting crew, we divide the part by its percentage.

15 / 75% = 20 painters in a painting crew

To check:
20 x 75% = 15
15/20 = 0.75 x 100% = 75%