Which method of solving proportions is illustrated in the problem and solution below?
?
For the problem “Apples cost $2.50 for 2 pounds. How much will 9 pounds cost?” the solution process is:
- Take the 2 pounds as a unit or “chunk.”
- Determine how much 8 pounds and 10 pounds would cost.
- Determine how much the cost would be for halfway between 8 and 10 pounds.
a. using a multiples table
b. using a unit rate
c. using unitizing
d. using the cross-product algorithm
ANSWER:
c
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