My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

In a fruit store, there was a unique weighing machine that was made to weigh only cherries and strawberries as they were priced the same.

Other fruits like watermelons or mango had different machines as they were expensive.

A man successfully buys watermelons at the price of cherries. How?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

Can you place six X (crosses) in below board without making three in a row in any way ?