Ответ:7
x+y=31
150x+200y=5000
150x+150y=4650
-150x-150y=-4650
50y=350
y=7
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Ответ:7
x+y=31
150x+200y=5000
150x+150y=4650
150x+200y=5000
-150x-150y=-4650
150x+200y=5000
50y=350
y=7
Y-количество стаканов 200 мл
X+Y=31
150X+200Y=5000 мл
Х=31-Y
150(31-Y)+200Y=5000
4650-150Y+200Y=5000
50Y=350
Y=7
Ответ :7