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Review: Ratio of a Cylinder's Dimensions
Explanation
We have a ratio with two parts,
so we can write it as a fraction with units:
This ratio is constant
throughout this question, so we can set one instance of the ratio equal to
another:
We could cross-multiply and
solve to find x, but we can also see
that the denominator on the right is twice that of the left, so the numerator
on the right must be twice that of the left, hence 
. The closest approximate choice is 9.
The correct answer is (C).
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