I make two people out of one. What am I?

You see me once in June, twice in November, and not at all in May. What am I?

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

What brings you down but never up?

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

How many words can a pen with half refill write?

In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents the same.Can you place 8 queens on the board in a manner that none of the queens can attack each other?

You can hear me, but you can't touch or see me.

What am I?

Prove that twice of ten is the same as twice of eleven.

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?