Three boxes are needed to hold 18 reams of paper. How many boxes are needed for 90 reams?
15
5
6
9
Detailed Explanation
The proportion \(\frac{\mathrm{3boxes} }{\mathrm{18reams}}\) = \(\frac{\mathrm{xboxes} }{\mathrm{90reams}}\) can be used to find the number of boxes.
Cross multiply: 3 × 90 = 18x, so 270 = 18x and x = 270 ÷ 18 =15boxes.
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