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gretel's goldfish

Hansel has goldfish that quadruple, or become four times as many, every month. Gretel has goldfish that increase by 20 every month. Right now, Hansel has 4 goldfish and Gretel has 128 goldfish. In how many months will they have the same number of goldfish? Show how you arrived at your answer.

(Source: Adapted from Mathematics Teaching in the Middle School, Nov-Dec 1995)

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