So the ratio of number A to number B is X: 8x/ 15.

When x is omitted,1:8/15 is obtained (1is 8/05).

(If multiplied by 15 at the same time)

Namely. 15:8

If b is 2/3, A is 2/3÷8/ 15=5/ 12.

(That is 65438+5/02)

It is troublesome for me to do this, but the process is very detailed and easy to understand.

You choose the key place to write.

Doing the problem is not plagiarism, the key is understanding.