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Question:

In a neighborhood, 2/5 of the houses are painted yellow. If there are 24 houses that are NOT painted yellow, how many yellow houses are in the neighborhood?

A 16
explanation

If 2/5 of the houses are painted yellow, then 3/5 of the houses are NOT painted yellow. Since there are 24 houses that are not yellow, divide 24 by 3/5 to find the total number of houses. Then subtract to find the number of yellow houses.
24 ÷ 3/5 = 24 × 5/3 = 40
40 – 24 = 16