1x+(24-x)×5=40
1x+24×5-x×5=40;
1x-5x=40-120;
-4x=-80;
x=20。
1x+(24-x)×5=40解:1X+120-5X=40 120-4X=40 120-40=4X 80=4X 80/4=X 20=X X=20