The change of base formula allows you to write a logarithm in terms of logarithms with another base. It follows this pattern,

where a≠1 and b≠1
Assigning the base to be 7,

I hope I was able to answer your question. Have a good day.
I believe it would be a to X is 20 units because A to B is 10 units so a to X would make sense if it was 20 units hope this helps!
Step-by-step explanation:
Given

as equation 1.
I used q-p as the difference as logically the woman will be older than her son.
Also given,

as equation 2.
Using equation 2,

substitute this equation into equation 1.

Substitute P into equation 2.

Therefore the woman is 45 years old while her son is 15 years old.
J = 88846
S = 74897
J = 4.6m + S
Plug in what you know.
88846 = 4.6m + 74897