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?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

Can you replace the question mark with the correct number?

Take away the whole and some still remain. What is it?

People put me on the table and cut me but do not eat me. What am I?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

What is next number in the pattern below:

131 517 192 123 ?