What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

How many sides does a circle have?

Can you find the key in the picture below?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

Which Burger Is Different in below image?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

How many words can a pen with half refill write?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?