I’m tall when I’m young, and I’m short when I’m old. What am I?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

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