Count the number of lines in the image below ?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

What is next number in the pattern below:

131 517 192 123 ?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Replace the question mark with the correct number below.

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?