Question

divisão proporcional, alguém sabe resolver?

Answer 1

5X+3Y-2Y=18
x/2 = y/3= z/5 ( mmc = 15 )

15X=10Y=6Z
X=10Y/15
Z=10Y/6

5X=18-3Y+2Z
X=(18-3Y+2Z)/5
1OY/15=(18-3Y+2(10Y/6))/5
50Y/15=(18-3Y+20Y/6)  (MMC=90)
300Y=1620-270Y +300Y
270Y=1620
Y=6


15X=10Y
X=(10 X 6 )/15
X=4


10Y =6Z
10 X 6= 6Z
Z=60/6
Z=10