<PRE><B>Question 886530</B>
A + M + S = 310
M = A+10
S = 2A
Substitute the known values from the bottom equations into the top equation:
A + M + S = 310
A + (A+10) + 2A = 310
4A + 10 = 310
Subtract 10 from each side
4A = 300
Divide each side by 4
A = 75
.
If Amy pays $75, then Sadie pays twice that much ($150) and Maria pays $85 ($10 more than Amy).
75 + 150 + 85 = 310</PRE>