Question

Drinking 8 fluid ounces of milk provides 270.0 milligrams of calcium. How many fluid ounces of milk provide 72.5 milligrams of calcium? Round to the nearest tenth.

Answer 1

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Answer 2

Set up a proportion:


`(8)/(270) = (x)/(72.5)`

The numerator represents fluid ounces of milk, and the denominator represents milligrams of calcium.

Simplify the first fraction to make multiplication easier:


`(8)/(270) / (2)/(2) = (4)/(135)`

`(4)/(135) = (x)/(72.5)`

Cross multiply the fractions:


`72.5 * 4 = 290`

`135x = 290`

Divide both sides by 135 to get x by itself:


`290 / 135 = 2.1`

`x = 2.1`


2.1 fluid ounces of milk provide 72.5 milligrams of calcium.