What goes up but never comes down?

Find the missing number in the image below.

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

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

Jessica is telling her friends this story and asks them to guess if it’s the truth or a lie: “There was a man sitting in a house at night that had no lights on at all. There was no lamp, no candle, and no other source of light. Yet, he sat in the house and read his book happily.” Her friends say she’s lying, but Jessica corrects them and says she’s telling the truth. Jessica’s story is true—but how?

A time long back, there lived a king who ruled the great kingdom of Trojan House. As a part of the renovation of the kingdom to meet future security needs, he asked his chief architect to lay down a new play in a manner that all of his 10 castles are connected through five straight walls and each wall must connect four castles together. He also asked the architect that at least one of his castles should be protected with walls. The architect could not come up with any solution that served all of King's choices, but he suggested the best plan that you can see in the picture below. Can you find a better solution to serve the king's demand?

I am quite hot but become too cold if you remove the first two letters. What am I?

I have teeth but i don't bite. Who Am I ?

Identify the hidden meaning behind this picture?