Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

Can you find the thief by just looking at the picture below?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

What number do you get when you multiply all of the numbers on a telephone's number pad?

You need to cut a round cake into eight equal pieces with just 3 cuts. Can you do it?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

Three logicians went to bar for having a drink. The bar person asks the logicians "Do they all want to have the drink?". The first logician replied, " I don't know". The second logician replied, " I don't know". What is the reply of the last logician?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

If 21x = 79x, what is the value of x?