Question

Trei numere sunt direct proporţionale cu 2, 3 şi 5, iar aritmeticǎ este 25. Aflaţi numerele.

Answer 1

{a;b;c}->dp{2;3;5}
a+b+c=25

a/2=b/3=c/5=k
a/2=k=>a=2k
b/3=k=>b=3k
c/5=k=>c=5k

(2k+3k+5k):3=25
10k:3=25
10k=75
k=7,5
a=15
b=22.5
c=37.5 
sper ca e bn

Answer 2

(a,b,c) dp (2,3,5)
a:2=b:3=c:5=k
a=2k,b=3k,c=5k
2k+3k+5k=25x3
10k=75
k=75:10
k=7.5
a=15
b=22.5
c=37.5