I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

Spot what is wrong here in below Picture?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

Chocolate costs 6 rupees and a Toy costs 5 rupees. If you have 32 rupees in total, how many chocolates and how many Toys can be purchased with that amount?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

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?