Can you place six X (crosses) in below board without making three in a row in any way ?

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?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Alex opened 24 presents
Jonah opened 8 presents
Clara opened 1 present

Can you find out how many presents were opened by Candy?

10+10 and 11+11 can give you the same answer.

Explain how?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

You can win me and lose me but never buy me
You can not eat me and never want to part with me
I can make you cry or bring you joy
I am not a machine and definitely not a toy
You keep me but i am not forever just yours
You might find me in a case or on a shelf next to a vase
I am hard and i am tall if you bump me i am sure to fall
I am made of different materials and am at many events
If your lucky and fight hard I might be yours
What am I ?

Find the last number in the series below:

voN luJ yaM raM ---

What kind of band never plays music?

You can see it everyday, But cannot touch it at will. What is it?