Because the number of questions is an integer and the wrong number of A is 1/9, the total number of questions must be a multiple of 9.
Total number of questions = no problem *6= no problem *2*3
In other words, the number of correct answers should be a multiple of 3.
That's 3 or 6.
Three words
The total number of questions is 3*6= 18.
A got it right18-18/9 =16.
Six words
The total number of questions is 6*6=36.
That's right. 36-36/9=32
B failed anyway, hehe.