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

What four weights can be used to balance from 1 to 30 pounds?

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?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

How many times can you subtract the number 5 from 25?

Can you count the number of quadrilaterals in the picture below?

Which digit occurred maximum times between the number 1 and 1000?

No matter how little or how much you use me, you change me every month. What am I?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?