Question

Fie sirul de rapoarte egale:

a/2=b/3=c/5. Dacă 5×a+2×b-c=77 , atunci a=? , b=? , c=?​

Answer 1

Răspuns:

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

a=2k

b=3k

c=5k

5a+2b-c=77

5·2k+2·3k-5k=77

10k+6k-5k=77

k=77:11=>k=7

a=2·7=14

b=3·7=21

c=5·7=35