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

Can you replace the question mark with the correct number?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

Who is that with a neck and no head, two arms and no hands? What is it?

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

What is the next shape from answers A, B, C, and D figure?

Find the next number in the following series:
6, 14, 26, 98, __?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?