Question

daca x supra2 = cu y supra3= cu z supra5;si 2 x + 3y+5z=76.determinati nr x y z

Answer 1

x=(2*z)/5
y=(3*z)/5

(4*z)/5+(9*z)/5+5*z=76
4z+9z+25z=76*5
38z=380
z=10
x=4
y=6

Answer 2

x/2=y/3=z/5=k

x=2k;    y=3k,    z=5k

2x+3y+5z=76
4k+9k+25k=76
 38k=76
k=2
x=2k=4  ; y=3k=6;  z=5k=10

x=4,    y=6,    z=10