How many words can a pen with half refill write?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Find the 8 in the below-given Image.

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

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

I have an apple tree , number of apple in this tree get doubles every week.

On 30th week , the tree gets completely filled with apples :-)



Can you tell me , on what week does my tree is half covered with apples ?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?