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 next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

Which city is three-fifths chick two third cat and 50% goat?

Can you count the number of children in the picture below

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Which is Odd One Out and why?

4377

3954

9862

8454

9831

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?