If Xiao Li gives Daming 100 stamps, his stamp will be twice as much as Xiao Li's. If Daming gives Xiao Li 10 stamps, her stamp will be six times as much as Daming's. how many stamps do Daming and Xiao Li have?

Let Xiaohong have X stamps and Xiaoli have y stamps, and set up a system of quadratic equations: x + 100 = 2 (y-100) x + 100 = 2y-200 2y-x = 300 (1) y + 10 = 6 (X-10) to simplify the two forms: y + 10 = 6x-60, that is, 6x-y = 70 (2) (1) + (2) · 2 to get x = 40 (1)

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