Question

3 numere sint direct proporțională cu numerele2,5 si 9.de aflat numerele daca media aritmetica este 48

Answer 1

(a+b+c)/3=48
a+b+c=48x3
a+b+c=144
a/2=b/5=c/9=k
a/2=k=>a=2k
b/5=k=>b=5k
c/9=k=>c=9k
2k+5k+9k=144
16k=144
k=144:16
k=9
a=2k=>a=2x9=>a=18
b=5k=>b=5x9=>b=45
c=9k=>c=9x9=>c=81