Question

alflati trei numere rationale ce sunt invers proportionale cu 0,(3);0,25;0,2 si au media aritmetica egala cu 60

Answer 1

0,(3)=3/9=1/3
0,25=25/100=1/4
0,2=2/10=1/5
a/3=b/4=c/5=k
a=3k
b=4k
c=5k
(3k+4k+5k)/3=60
3k+4k+5k=180
12k=180 =>k=15
=>a=45
=>b=60
=>c=75