Gayatri Verma was a bright 12-year-old girl. She wanted a bike. But her family couldn’t afford(买得起) to buy her a bike. One day, Gayatri saw a small pink envelope lying on the ground. She picked the envelope up and put it in her pocket. At lunch time, Gayatri met her friends in the restaurant. To get some chocolate, Gayatri gave her friend, Mitu, the envelope. Then Mitu traded the envelope for a new pencil with a girl called Lovely in class. Lovely found that there were several numbers on the envelope.