[Question]: In a house, there are 16 cats. Two of them are white, and 25% of them are black. The rest of the cats are grey. How many grey cats are in this house?
[Answer]: In this house, there are 16 * 25 / 100 = 4 black cats. If there are two white cats, that means that there are 16 - 4 - 2 = 10 grey cats in this house.
So the answer is 10.

[Question]: Lola’s rabbits keep having kittens each spring. During the first spring, her 10 breeding rabbits had 10 times as many kittens as the number of breeding rabbits Lola has, and half of the kittens got adopted. 5 of them had to be returned to Lola due to re-homing problems. During the next spring, her 10 breeding rabbits only had a total of 60 kittens, with 4 of the kittens being adopted. Including the breeding rabbits, how many rabbits does Lola have in her house?
[Answer]: Lola’s breeding rabbits made 10 * 10 = 100 offspring. 100 / 2 = 50 got adopted. 5 offspring came back which made Lola have 50 + 5 = 55 of them. In the next spring, 60 - 4 = 56 new offspring stayed with Lola. In total, there are 55 + 56 = 111 offspring. Including the breeding rabbits, there are 111 + 10 = 121 rabbits in total.
So the answer is 121.

[Question]: Marj has two $20 bills, three $5 bills, and $4.50 in loose coins in her wallet. If she buys a cake that costs $17.50, how much money will be left in her wallet?
[Answer]:
Two $20 bills amount to $20 x 2 = $40. Three $5 bills amount to $5 x 3 = $15. So, Marj has $40 + $15 + $4.50 = $59.50 in her wallet. If she buys a cake, she will be left with $59.50 - $17.50 = $42.
So the answer is 42.