What two things can you never eat for breakfast?

I am the fastest animal but cannot climb the tree. What am I?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Out of four images which one is the odd one out?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

If 21x = 79x, what is the value of x?

What has 88 keys?