How do you go from 98 to 720 using just one letter?

Can you count the number of quadrilaterals in the picture below?

What is the word or phrase?

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

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

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

What can go through glass without breaking it?