No, when you have a zero in that space you don't necessarily need an addendum unless it helps you.
Answer:
Ok, so we can express the boys as another letter. just express them as the letter B for boys.
Step-by-step explanation:
I really don't know why.
9 I think because 1/4 needs to have 4 of those to be a whole so yeah 9.
3.4x3=10.2...
hope this helps!!