Three boxes are needed to hold 18 reams of paper. How many boxes are needed for 90 reams?

Three boxes are needed to hold 18 reams of paper. How many boxes are needed for 90 reams?

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.

Cross multiply: 3 × 90 = 18x, so 270 = 18x and x = 270 ÷ 18 =15boxes.