what does the below rebus means?

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?

Why is Saturday stronger than Monday?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

In which direction should the missing arrow point?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

No one wants to have it, but if one got it, he does not want to lose it. What is It?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho