OG详解-OG7 数学2 Q11

Choice D is correct. It’s given that the equation 80S+90C = 1, 120 represents this situation, where S is the number of square tokens won, C is the number of circle tokens won, and 1, 120 is the total number of points the tokens are worth. It follows that 80S represents the total number of points the square tokens are worth. Therefore, each square token is worth 80 points. It also follows that 90C represents the total number of points the circle tokens are worth. Therefore, each circle token is worth 90 points. Since a circle token is worth 90 points and a square token is worth 80 points, then a circle token is worth 90-80, or 10, more points than a square token.
Choice A is incorrect and may result from conceptual or calculation errors. Choice B is incorrect. This is the number of points a circle token is worth.    Choice C is incorrect. This is the number of points a square token is worth.