Question

Mr. Miles has pounds of clay to make 3 models. He uses pounds to make each model.

Mr. Miles says he has about 3 pounds of clay left. Is his statement reasonable?
A.
This is not reasonable because pounds can be rounded to 7 pounds and pounds can be rounded to 2 pounds. Since 7 - 3(2) = 1, he would have about 1 pound of clay left.

B.
This is not reasonable because pounds can be rounded to 8 pounds and pounds can be rounded to 2 pounds. Since 8 - 3(2) = 2, he would have about 2 pounds of clay left.

C.
This is reasonable because pounds can be rounded to 8 pounds and pounds can be rounded to 2 pounds. Since 8 - 2(2) = 4, he would have about 4 pounds of clay left.

D.
This is reasonable because pounds can be rounded to 7 pounds and pounds can be rounded to 2 pounds. Since 7 - 2(2) = 3, he would have about 3 pounds of clay left.

Answer 1

B. Not reasonable. Round the total to 8 lb and each model to 2 lb, then 8 − 3(2) = 2, so he'd have about 2 pounds left, not 3.