Hello,

Yes

Yesb.) 30

Hmmm I get 36, please check it ^^c.) 31

Yesd.) 20

No, but not far. When in base 5, the digit number must not exceed 4.And then I have to do the following:

1.) (22+44)_5 = ?

2.) (32-14)_5

I said:

1.) 71

So 7=5+2 is transformed into 12.

Hmm... I think there is a difference here :2.) 12

you're not asked for (32)_5 - (14)_5 (which result is 13, not 12), but for (32-14)_5, that is to say (18)_5 = (23)_5

If you do not agree, tell me