2.0.4/2=0.5/2.5

1. From the question, you can set 5/8 of x equal to Y.

That is 5/X=y/8.

Get: X*Y=5*8=40.

Four combinations of 1, 40 2, 20 4, 10 5, 8 can be obtained. You can bring it in.

2. The principle is the same as above, 0.7,90.9,7 is enough.