I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

I have Rs.50 and I spend it in the way as below.

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

What number do you get when you multiply all of the numbers on a telephone's number pad?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

Find the value of "?" in the ball picture Riddle below:

If,

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

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

D + F = ?

John, a 5-year-old boy, was really fond of the chocolates. He asked his Mother to give him some money to buy his favourite chocolates. His Mother gave him $45. He went to the shopkeeper and asked, "How much is one chocolate for?". The shopkeeper said $3 for one chocolate. Also, if you give me the wrappers of three chocolates, I will give you one for the exchange.
In total, how much chocolate could John eat?

What English word has three consecutive double letters?

Can you find a number that lies one third of the distance between 1/3 and 2/3?