Prove that the below maths equation is true.

8 + 8 = 91

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

If eleven plus two equals one, what does nine plus five equal?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

When a clock is observed, the hour hand is at a minute mark and the minutes hand is six minutes ahead of it.

When the clock is observed again after some time, the hour hand is precisely on a different minute mark and the minute hand is seven minutes ahead of it.

Can you calculate how much time has elapsed between the two observations?

Whats the next number in the below number sequence pattern.

Can anyone tell me a word in the English dictionary which has a silent 'z'?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?