Question 320129
20X+10(41-X)=540
20X+410-10X=540
10X=540-410
10X=130
X=130/10
X=13 ANS. FOR THE NUMBER OF $20 COINS.
41-13=28 ANS. FOR THE NUMBER OF $10 COINS.
PROOF:
20*13+10*28=540
260+280=540
540=540