Question

Determinati x,y si z stiind ca sunt direct proporționale cu 0,1; 0,2; 0,3 si 3x+2y+5z=330

Answer 1

0,1=1/10
0,2=2/10=1/5
0,3=3/10
10x=5y=10z/3=k
x=k/10
y=k/5
z=3k/10
3k/10 + 2k/5 + 3k/2 = 330
Numitor comun 10
3k+4k+15k=3300
22k=3300 |:22
k=150
x=150/10 =>x=15
y=150/5 => y=30
z=(3•150)/10 => z=45