Cooper is measuring ingredients for his special dessert. He needs a total of 70.4 mL of milk and melted butter. The recipe calls for 30.6 mL of butter. How much milk, m, does Cooper need for his recipe?

The milk and butter together must total 70.4 mL, and 30.6 mL is butter. Subtract the butter from the total: 70.4 − 30.6 = 39.8 mL. Cooper needs 39.8 mL of milk, which is choice B.

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