How can you make number one disappear by adding something to it?

I have Rs.50 and I spend it in the way as below.

Sally lives in a place where six months of the year is mild summer and the temperature drops significantly the other six months. She owns a lake where there is a small island. She wants to build a house on the island and needs to get materials there. She doesn’t have a boat, plane, or anything to transport them to the island. How does Sally solve this problem?

There is something which is always coming but never arrives?

Can you find the six hidden animals in the picture below?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

Prove that twice of ten is the same as twice of eleven.

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

What will you call your mother's brother's brother-in-law?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?