John is the son of Jacob.
So,
Jacob is the_____of John's father?

When can we add 2 to 11 and get 1 as the correct answer?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

What two things can you never eat for breakfast?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?