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In the Butterfly Museum, there are only pink and yellow butterflies. The ratio of the number of pink butterflies to the number of yellow butterflies is 3:5. If there are 18 pink butterflies, how many butterflies are there altogether?
If there’s 18 pink butterflies then if you look at the ration for every 3 pink butterflies there are 5 yellow butterflies, so divide 3/18 to get 6 the multiply 6*5 to get 30 yellow butterflies