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Solid geometry word problems

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Manuel bought a balloon (that is a perfect sphere) with a radius of 2, start text, space, c, m, end text. He wanted his balloon to be bigger, so he blew 2 big breaths of air into the balloon. Each big breath increased the balloon's radius by 1, start text, space, c, m, end text.
What is the ratio of the current volume of the balloon to the original volume of the balloon?
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