What is black when you buy it, red when you use it, and gray when you throw it away?

John was born on March 5, 1970, in Delhi, India. Jacob was born 25 days before John. The year when they took birth, Republic Day fell on Monday.

Can you find out on what day was Jacob born?

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 ?

Through your logical capabilities, can you make 7 an even?

What does this simple rebus mean?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

what does the below rebus means?

I am something people love or hate. I change peoples appearances and thoughts. If a person takes care of them self I will go up even higher. To some people I will fool them. To others I am a mystery. Some people might want to try and hide me but I will show. No matter how hard people try I will Never go down. What am I?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

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?