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

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

What does this rebus means ?

PROG WORKRESS

Can you name an animal whose killing cannot be performed without spilling your own blood?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

When is the top of a mountain similar to a savings account?

A man dies of old age on his 25 birthday. How is this possible?

I always drive my customer away.

Who am I?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?