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?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

Replace the question mark with the correct number in below Picture:

A newspaper is supposed to have 60 pages, but pages 24 and 41 are missing.
Which other pages won't be there?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Which is heavier: a ton of bricks or a ton of feathers?

A car is crossing a 20 km-long bridge. The bridge can support at most 1500kg of weight over it. If somehow, the weight on the bridge becomes more than that, it will break.

Now, the weight of the car is exactly 1500kg. At the midway, a bird comes and sits on the roof of the car. This bird weighs exactly 200 grams.
Can you tell if the bridge breaks at this point or not?

O_er_t_o_

Complete the missing letters of the given word.