What is common among 11, 69, and 88?

Find out the missing number in the picture attached:

Find the value of "?" in the ball picture Riddle below:

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Can you make the below equation true by using any three numbers from "1, 3, 5, 7, 9, 11, 13 and 15"?

( ) + ( ) + ( ) = 30

John needs to purchase 100 chocolates from three different shops and he has exactly 100 rupees to do that which he must spend entirely. He must buy at least 1 Chocolate from each shop.

The first shop is selling each chocolate at 5 paise, the second is selling at 1 rupee and the third is selling at 5 rupees.

How many chocolates should he buy from each shop?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

What is the difference between a jeweller and a jailer?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

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