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Dean and Sam had a total of $123 at first.

Mary gave Sam $7 and John gave Sam $10.

In the end, Sam had thirteen times as much money as Dean.

(a) How much money did Sam have at first?

(b) How much money did Dean have at first?

Notes to students:

If the question above has parts, (e.g. (a) and (b)), given that the answer for part (a) is 10 and the answer for part (b) is 12, give your answer as:10,12