x + y = 95(0.4*x + 0.78*y)/95 = 0.6
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x + y = 95(0.4*x + 0.78*y)/95 = 0.6
x + y = 95
(0.4*x + 0.78*y)/95 = 0.6
x + y = 95(0.4*x + 0.78*y)/95 = 0.6
化简得
x + y = 95
20x+39y=30*95
-*20得
19y=10*95
y=50
代入
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