In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

What can you hold in your right hand, but never in your left hand?

Can you identify the hidden rebus in the image below?

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

You can see it everyday, But cannot touch it at will. What is it?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

Can you make four (4) nines (9) equal 100?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?