Question

daca x/2=y/3=z/5 si x+y+z=20,aflati numerele x,y,z.

Answer 1

x/2=y/3=z/5=K
x/2=K => x=2K
y/3=K => y=3K
z/5=K => z=5K
x+y+z=20
2K+3K+5K=20
10K=20
K=2
X=2K=4
Y=3K=6
Z=5K=10

Answer 2

x/2=y/3 =z/5  ;x+y+z=20
x/2+y/3+z/5 =x+y+z/2+3+5 =20/10 =2
x/2 =20  ;  x=2*4 =4
y/3 =2  ; y=2*3 =6
z/5 =2  ;  z=2*5 =10

( V : 4+5+10=20 )