Question

determinati nr x,y si z stiind ca x/14 =y/11=z/12 ; x+y-z=39 ca rog frumos dau coroana

Answer 1

x/14=y/11=z/12=k,
x+y-z=39
x/14=k⇒x=14k
y=11k
z=12k
14k+11k-12k=39
13k=39
k=3
x=14·3=42
y=11·3=33
z=12·3=36