If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

What has 88 keys?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

How can you make number one disappear by adding something to it?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

What can you see in the middle of March and April that you can never see in any other month?