Question 60876
18A+8C=288 &
A+C=21 THEN
A=21-C NOW REPLACE A BY (21-C) IN THE OTHER EQUATION
18(21-C)+8C=288
378-18C+8C=288
-10C=288-378
-10C=-90
C=-90/-10
C=9 SOLUTION.
THEN
A+9=21
A=21-9
A=12 SOLUTION
PROOF
18*12+8*9=288
216+72=288
288=288
MUCH BETTER PROBLEM!!!