Question 62515
s = m + 6
m = s - 6
s = d + 12
d = s - 12
s + m + d = 75
s + (s - 6) + (s - 12) = 75
3s - 18 = 75
3s = 93
s = 31
m = s - 6
m = 31 - 6
m = 25
d = s - 12
d = 31 - 12
d = 19
Sam has $31, Mark has $25, Dean has $19
check
s + m + d = 75
31 + 25 + 19 = 75
OK