asked • 11/30/16

Word Problem

Mr. White can paint his barn in 5 days. What part of the barn is still unpainted after he has worked for x days?

1 Expert Answer


Mark M. answered • 11/30/16

5.0 (243)

Mathematics Teacher - NCLB Highly Qualified

MIke L.

The fraction is (5-x)/5. However, this assumes he paints uniformly throughout all 5 days. All we know is that he can paint the barn in 5 days, but its possible that one half of the house takes 4 days to paint and the other half takes only 1 day, for whatever reason. So there is a lack of information to properly solve this puzzle.


Mark M.

Having encountered many problems of this type in my teaching career, niformity is assumed. Calculus is the proper domain of non-linear change.


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