When a person buys meat, his money is fifteen yuan short of a catty and sixteen yuan more than half a catty. Ask him how much money he has and how much meat is a catty. By the way, how to calculate it?
Let's say that the money on him is X yuan and the meat is Y yuan per catty.
When buying a kilo: Y-X = 15.
When buying half a catty: X-1/2Y = 16.
Solving this quadratic equation leads to:
The money X on me is 47 yuan.
The price of meat y is 62 yuan per catty.