Each Friday, the sixth grade students in Mr. Shin's physical education class spend the first five minutes doing crunches. Instea
d of keeping track of the weekly total number of crunches, Mr. Shin keeps track of how they do compared to the week before, and then records the result as a positive or negative number. Record the number for each of the following: Ben did 10 more crunches this week than last week. What number would Mr. Shin record?
Gail did 8 less crunches this week than last week. What number would Mr. Shin record?
Nathaniel did the same number of crunches this week as last week. What number would Mr. Shin record?
A + B + C = 518 ft^3 A = 1/3B, or 3A = B B = C A + B + C = 518 ft^3 1/3B + B + B = 518 7/3B = 518 B = 518×3/7 = 222 ft^3 A = 1/3B = 1/3×222 = 74 ft^3 C = B = 222 ft^3
