Question

Fie șirul de rapoarte egale a/5=b/6=c/7.daca a+b+c=45 atunci:a=?, b=?, c=?.

Answer 1

a/5=b/6=c/7=K

a/5=K => a=5K

b/6=K => b=6K

c/7=K => c=7K

Vom inlocui a b c

5K + 6K + 7K = 45

18K=45

K= 2.5

Ne intoarcem la a b c

a=5K => a=2.5 × 5 = 12.5

b=6K => b=2.5 × 6= 15

c=7K => c=2.5×7= 17.5

Verificare

12.5+15+17.5=27.5+17.5=45