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respuest mala y
entonces x ₊ y =30 DESPEJAS x = 30- y
0.75 x ₊ 0.25 Y =10.5
0.75(30- y ) ₊ 0.25 y = 10.5
22.5 - 0.75 y ₊ 0.25y =10.5
y = 24
correctas 6 malas 24