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.

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Set up a proportion:



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

Simplify the first fraction to make multiplication easier:




Cross multiply the fractions:




Divide both sides by 135 to get x by itself:




2.1 fluid ounces of milk provide 72.5 milligrams of calcium.