Tums,

Suppose Mrs. Jones tried to arrange the tests into 3 piles, the ones she graded in the first hour, the ones she graded in the second hour and the ones she graded in the third hour. She can't do this exactly since 121 is not divisible by 3. 121/3 = 40 1/3 so she is one-third of the way through test number 41 at the end of the first hour. I would say that at the end of the first hour she has graded about 40 or 41 papers. About how many test did Mrs. Johns grade in 2 hours?

Penny