A SINGLE WORD. Tricky, eh? But you can’t complain, since I gave you the answer.

It depends. Usually, math has one right answer, but in this case, the order of operations can get a little quirky.

There are two ways to solve this. First, like so:
48 / 2 × (9 + 3) = ?
48 / 2 × (12) = ?
24 × 12 = 288

But another, arguably valid way is:
48 / 2 × (9 + 3) = ?
48 / 2 × (12) = ?
48 / 24 = 2

Thanks to KnowYourMeme for providing a great overview on this one. Math StackExchange has more discussion.

31 years ago.

Here’s one way to solve it.

Let x = how many years ago

We get this equation: 67 – x = 3 × (43 – x)

Solving for x gives us 31.

D. Tomcat

The number of letters of each animal corresponds to the number of the letters in each month. And the first letters spell “Gets Goat”.

January / Giraffe = 7 letters
February / Elephant = 8 letters
March / Tiger = 5 letters
April / Snake = 5 letters
May / Gnu = 3 letters
June / Oryx = 4 letters
July / Anoa = 4 letters
August / Tomcat = 6 letters