Answer:
18 1/3 + y = 33 1/4
Explanation:
The original string of yarn is 33 1/4 inches of 33.25 inches and it is cut. We know that one piece is 18 1/3 inches meaning the other half of the string must be a number added to 18 1/3 to equal 33 1/4. Therefore, the addition equation would be 18 1/3 + y = 33 1/4 .