Question

设黑棋x,白棋y.(y-5)/x = 2/3 (x-20)/(y-5) = 5/6

Answer 1

由1式,

y-5 = 2x/3

代入2式,

3(x-20)/2x = 5/6

9(x-20) = 5x

4x-180 = 0

x=45

代回1式,

(y-5)/45 = 2/3

y-5 = 30

y=35