1 .30/0.5x-30/0.6x=2 2 .x/4-x/5=0.1

1 .30/0.5x-30/0.6x=2 2 .x/4-x/5=0.1
1 .30/0.5x-30/0.6x=2 2 .x/4-x/5=0.1

1 .30/0.5x-30/0.6x=2 2 .x/4-x/5=0.1
30/0.5x-30/0.6x=2
60/x-50/x=2
10/x=2
x=5
x/4-x/5=0.1
1/4x-1/5x=0.1
1/20x=0.1
x=0.1×20
x=2

30/0.5x-30/0.6x=2
60x-50x=2
10x=2
x=0.2
x/4-x/5=0.1
1/20x=0.1
x=0.1÷1/20
x=2