A recipe calls for 375 g of flour for every 50 g of sugar. How much flour would you need if you used 125 g of sugar?

Question

• Solve the problems and show all of your thinking. You could use a double number-line model.

• Explain how you know each answer makes sense.

Answer 1

In a proportion the product of means is equal to the product of extremes.

If a:b::c:d then bc=ad

flour:sugar::flour:sugar

375:50::y:125

50y=375x125

y=375x125/50=937.5

937.5 g of flour will be needed.