I’m tall when I’m young, and I’m short when I’m old. What am I?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

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?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Which five letter word can be added at the end of below word to form a
valid word?

> Pin
> Check
> Boiling
> View

What is both possible and impossible at the same time?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

Why are televisions attracted to people?