Prove that the below maths equation is true.

8 + 8 = 91

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?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

On the dull night when the blonde was dozing, she heard an odd clamour and she saw that there was a bizarre man with a gun simply outside her home. So she raced to the telephone to call the police, however, she can't dial 911. Why?

When we see 2 but call 10?

What four weights can be used to balance from 1 to 30 pounds?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?