Question 770673
A*B=8, B*C=28, C*D=63 and B*D=36

C*D=63 tells us that C and D are odd in fact one of them is likely 7. Assume C=7.


B*C=28 means B=4, and so

A*B=8 means A=2

checking B*D ...

4*9 = 36


so...

A=2, B=4, C=7, D=9



:)