IMSO 2007 Mathematics — Taiwan Second Round Short Answer (20 Questions) Question 1

**General instructions.** Short Answer: there are 20 questions, fill in the correct answers in the answer sheet. Each correct answer is worth 2 points. Time limit: 60 minutes.

Amongst the children in a family each boy has many sisters as brothers, but each girl has only half as many sisters as brothers. How many children are there in the family?