What is more useful when it is broken?

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 part of the chicken has the most feathers?

What word is pronounced the same if you take away four of its five letters?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Be active and find the killer in the picture Riddle below.

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

Count the number of triangles in the given picture.

If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?