I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

What has to be broken before you can use it?

There is a hypothetical state between the USA and Mexico border 'Tango'.
Here 70 percent of the population have defective eyesight, 75 percent are hard of hearing, 80 percent have Nose trouble and 85 percent suffer from allergies, what percentage (at a minimum) suffer from all four ailments?

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

Name a key which is hardest to turn.

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

I cannot talk, but I always reply when spoken to. What am I?

Can you spot the man between the coffee bean in the picture below ?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?