Before Mount Everest was discovered, what was the highest mountain in the world?

Two friends Smith and Andrew were talking about the bravery of their families. Smith told great stories about his courageous grandfather who fought for Britain in "World War I". Andrew told that his grandfather was so brave that in 1919 just after the war he was honoured with a bravery medal with the words "For our Courageous Soldiers In World War I" embedded into it. Smith knows that his friend is lying. How?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

What is the word or phrase?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

What has 13 hearts but no other organs?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

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

A maths symbol is hidden in the below Bar Graph. Can you decipher it?