I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

After teaching his class all about Roman numerals (X = 10, IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The teacher's only stipulation was that the pen could not be lifted from the paper until the line was complete.

Can you spot the hidden girl in the picture below?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?