A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

what does the below rebus means?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

I add 5 to 9 and get 2. The answer is correct, so what am I?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

How many letters are in the alphabet?

John can eat 27 chocolates in an hour, Jacob can eat 2 chocolates in 10 minutes, and Jolly can eat 7 chocolates in 20 minutes. How long will it take them to share and eat a box of 120 chocolates whilst playing Chess?