What does below rebus means ?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

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?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

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 ?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

What goes up but never comes down?

Which fur should we be getting from the Lion?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?