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20%x + 25% y = 30
x + y = 135
0,2x + 0,25y = 30 /(-4)
x + y = 135
-0,8x - y = -120
x - 0,8x = 135 - 120
0,2x = 15 /x5
x = 15 x 5 = 75
x + y = 135
75 + y = 135
y = 135 - 70 = 60