Question

a recipe calls for 5 cups of oats for every 3 cups of raisins. How many cups of oats are needed for 12 cups of raisins

Answer 1

20 because the ratio is 5:3 so you need to multiply 3×4 to equal 12 so 5×4 equals 20 so the equal ratio is 20 cups of oats

Answer 2

You would need 20 cups of raisins. :)