If Don has 3 more than 2 times the number of marbles Mark has, how many does each boy have to sell if the total number of marbles is 69?

Answer 1

D= 3+ 2M

D+M = 69

3 + 2M + M = 69

3M = 69-3 = 66

M = 66/3 = 22 marbles for Mark

D=3+2(22) = 3+44 = 47 marbles for Don

22+47 = 69 total marbles