Question

daca x supra 2 = y supra 3 =2zsupra 5 si x+y+z =45supra 2 aflati x+y?

Answer 1

x/2=y/3=2z/5=k
x/2=k⇒x=2k
y/3=k⇒y=3k
2z/5=k⇒z=5k/2
2k+3k+5k/2=45/2
(4k+6k+5k)/2=45/2                  ·2
15k=45
k=45/15=3
x=2k=2·3=6
y=3k=3·3=9
z=5k/2=5·3/2=15/2
x+y=6+9=15