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

Count the number of lines in the image below ?

There is a circular car race track of 10km. There are two cars, Car A and Car B. And they are at the exact opposite end to each other. At Time T(0), Both cars move toward each other at a constant speed of 100 m/seconds. As we know both cars are at the same speed they will always be the exact opposite to each other.
Note, at the center, there is a bug which starts flying towards Car A at time T(0). When the bug reaches car B, it turns back and starts moving towards the car A. The speed of bug is 1m/second. After 5 hours all three stop moving.
What is the total distance covered by the bug?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

What can jump higher than a building?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

Nodes are shown below and you need to connect them based on the following rule: Every node can be connected to the number of nodes inside them, i.e. the first node there is a value of 1 which indicates that the first node can connect to exactly one node only.Can you do it?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

By using 'because' continuously three times, can you make an English statement ?

What has lots of eyes, but can’t see?