Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

You need to remove two matchsticks to make the below equation true. Can you do it ?

Solve this riddle by finding the odd one out from the rest.

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

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.

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Jack have ten pairs of black socks, eight pairs of white socks and seven pairs of green socks. Everything is mixed in a draw. As there is no light he were not able to identify the colour of the socks. How many of the socks did he want to take to match one pair

I have branches, but no fruit, trunk or leaves. What am I?

When monkey rotate the gear, which mark will be hit 1 or 2 ?