What can you see in the middle of March and April that you can never see in any other month?

You have three orange, two pink and five purple balls in the drawer beside your bed. There is no electricity and the room is entirely dark. How many balls must you take out to ensure at least one ball of each colour at least?

When is the top of a mountain similar to a savings account?

Do you know who was buried in John's tomb?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

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

What does this say?

XLR8

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?