It takes 3 painters 4 hours to paint 1 classroom. How many hoursdoes it take 1 painter to paint 2 classrooms of the same size as the first one? Assume all painters work at the same rate for the full time.
+6251 \(\text{each painter works at the rate of }\\ r=\dfrac{1}{3\cdot 4} = \dfrac{1}{12} ~\dfrac{room}{hr}\\ \dfrac{2~ room}{r} = 24 ~hrs\)
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+1252 Well, it takes 1 painter \(4\times 3=12\) hours to paint a classroom, so just multiply by 2 and get your answer of 24 hours.
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