We have a question: For football season, Zachary wants to buy a new football, a pair of shorts, and a pair of football shoes. The ball costs $3.75, the shorts cost $2.40, and the shoes cost $11.85. Zachary has $10. How much more money does Zachary need?
And an answer: 8
So how you got the answer?
The total cost of the ball, the shorts, and the shoes is $3.75 + $2.40 + $11.85 = $18. Zachary needs $18 $10 = $8 more.

We have a 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?
And an answer: 10
So how you got the 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.

We have a question: There are 66 goats at a farm and twice as many chickens. If the number of ducks is half of the total of the goats and chickens, and the number of pigs is a third of the number of ducks, how many more goats are there than pigs?
And an answer: 33
So how you got the answer?
There are 66 x 2 = 132 chickens. There are 66 + 132 = 198 goats and chickens. There are are 198 / 2 = 99 ducks. There are 99 / 3 = 33 pigs. There are 66 - 33 = 33 more goats than pigs.