I tend to avoid that one because of the tokenization aspect. This popular one is a bit better:

"Alice has N brothers and she also has M sisters. How many sisters does Alice's brother have?"

The 7b one messed it up first try:

>Each of Alice's brothers has \(\boxed{M-1}\) sisters.

Trying again:

>Each of Alice's brothers has \(\boxed{M}\) sisters.

Also wrong. Again:

>\[ >\boxed{M + 1} >\]

Finally a right answer, took a few attempts though.