If 1+9+8=1, what is 2+8+9?

Which five letter word can be added at the end of below word to form a
valid word?

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

John went to buy some expensive, foreign chocolates. He only had Rs 100 with him. When he reached the shop, he got out and know that on those chocolates, there was a 15% import duty and 5% VAT.

How much worth chocolate should he buy so that he can accommodate it in Rs 100?

If your uncle’s sister is not your aunt, what relation is she to you?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

When we see 2 but call 10?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

Why is a river so rich ?