Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

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

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 ?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

Thirty friends were on a hiking trip when they decided to enjoy the bonfire. They assembled for it and agreed to play a game. For that, they divided themselves into five teams with seven members each, forming five rows.

How did they manage to achieve this formation?

Who can jump higher than a Mountain?

Can you name some countries which do not have the alphabet 'A' in them?

Can you spot the man between the coffee bean in the picture below ?

Which word does the below Plexor means ?