Don has 1 more than 3 times the number of marbles Mark has. How many does each boy have if the total is 73?

Answer 1

D = 1 + 3m

D+ m = 73

1 + 3m + m = 73

4m +1 = 73

4m = 72

m = 18

DOn has 1 + 3(18) = 1 + 54 = 55 marbles

and Mark has 18 marbles