Okay, that means for the original lot of 25 queens, they would mate about 8 times in total, so 8 kittens per year for 4 years=32 kittens for 1 queen. 32 kittens x 25 queens=800 kittens, 400 of which would be female...

My head is hurting now - and this makes me thankful that I didn't decide to take up accounting or another math-based career.