You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

What does below rebus means ?

Find the next number in the series.
1 10 24 43 67 ?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

There are seven sisters in a house in a village where there is no electricity or any gadget.

Sister-1: Reading Novel
Sister-2: Cooking
Sister-3: Playing Chess
Sister-4: Playing Sudoku
Sister-5: Washing clothes
Sister-6: Gardening

what is Sister-7 doing ?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?