Question

stiind ca 2x+3y-4z = 210 si x,y,z sunt invers proportionale cu 0,5 ;0,2 si 0,(3)  , aflati x,y,z 

Answer 1

0,5=5/10=1/2
0,2=2/10=1/5
0,(3)=3/9=1/3

x,y,z  ip cu 1/2; 1/5, 1/3 

x* 1/2= y* 1/5 =z* 1/3 =k
x/2=y/5=z/3=k
x=2k
y=5k
z=3k

4k+15k-12k=210
7k=210
k=30

x=60
y=150
z=90