Name a key which is hardest to turn.

What makes this number unique: 8,549,176,320?

What Adam and Eve do not have but the rest of the people have?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

During which month do people sleep the least?

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

Can you count the number of triangles in the given figure?

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

How many bananas can you eat if your stomach is empty?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???