Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

What do you see in the given picture?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

What happened when the wheel was invented?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

In the image below, can you find the value of an angle(y)

There are hundred red gems and hundred blue gems. The blue gems are priceless while the red gems equal wastage. You have two sacks one labeled Heads and the other Tails. You have to distribute the gems as you want in the two sacks. Then a coin will be flipped and you will be asked to pick up a gem randomly from the corresponding sacks.

How will you distribute the gems between the sacks so that the odds of picking a Blue gem are maximum?