Question 59288
LETX=THE NUMBER OF $.24 CENT STAMPS
LET(20-X)=THE NUMBER OF $.37 CENT STAMPS
.24X+.37(20-X)=6.62
.24X+7.40-.37X=6.62
-.13X=6.62-7.40
-.13X=-.78
X=-.78/-.13
X=6 $.24 CENT STAMPS THEN
20-6=14 $ .37 CENT STAMPS
PROOF
.24*6+.37*14=6.62
1.44+5.18=6.62
6.62=6.62