In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

What is the difference between a jeweller and a jailer?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Where do fish keep their money?

What is black when you buy it, red when you use it, and gray when you throw it away?