To decorate a cake, you make a shade of green icing using 3 drops of yellow food coloring for every 4 drops of blue. If you use 12 drops of yellow food coloring, how many drops of blue food coloring would you need?

Question

anonymous · Answer

$$3x \div60=20$$

anonymous · Answer

So 20 drops of blue food coloring

anonymous · Answer

yellow              3              12
------    =  -----    =  -----
blue                4                x

cross multiply
(3)(x) = (12)(4)
3x = 48
x = 48/3
x = 16
so, 3/4 = 12/16

This is a proportion, and basically a proportion is nothing but equivalent fractions.
As you can see...12/16 reduces to 3/4.

anonymous · Answer

that would be 16 drops of blue food coloring needed for 12 drops of yellow.

goformit100 · Answer

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