Question

Am nevoie de ajutor la aceste exerciții!!!​

Answer 1

7) x/2=y/3= k,

x=2k, y=3k

x+y=125, 2k+3k= 125, 5k= 125, k= 25

x=2*25=50

y=3*25=75

xy= 50*75= 3.750

8) 0,2x=0,(3)y=0,5z= k

x=k/0,2= 10k/2= 5k

y=k/0,(3)=9k/3=3k

z=k/0,5= 10k/5=2k

x+y+z= 80

5k+3k+2k=80, 10k=80, k= 8

x=5*8=40,

y=3*8=24

z=2*8=16