Two positive integers have a sum of 52. If their greatest common factor is 4, what is the least possible positive difference between the numbers?

*Solution to yesterday’s problem:*

If Carlo needs two cans of paint to coat three walls, then his rate of “paint usage” is cans per wall. If he needs to paint eight 4-walled rooms, he has to paint 32 walls total. He also needs to paint **two coats** per wall, which is equivalent to painting 32 x 2 = 64 walls total. Using the rate mentioned above, we can write

to represent the number of cans of paint he needs. This evaluates to , or . Remember that Carlo couldn’t very well buy two-thirds of a can of paint, so we round up to *43 cans*.

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