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.
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?
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