posted by Jessi on .
How do you solve this:
A 20-ounce bag of popcorn costs $2,80. If the unit price stays the same, how much does a 35-ounce bag of popcorn cost?
One way to solve this is by setting up a proportion and cross multiplying.
20 / 2.8 = 35 / x
Or you could figure the cost per ounce.
20 / 2.8 = ??
Multiply your answer by 35.