Question

daca a/3=b/5=c/7, iar a +b+c=105. Află a,b și c.​

Answer 1

a/3=b/5=c/7=k/1

a=3k b=5k c=7k

a+b+c=105

3k+5k+7k=105

15k=105

k=105:15

k=7 => a=3×7=21

b=5×7=35

c=7×7=49

Answer 2

Răspuns:

a,b,c d.p. cu 3,5,7

a/3=b/5=c/7=K

a=3k

b=5k

c=7k

a+b+c=105

3k+5k+7k=105

15k=105

k=105:15

k=7

a=3k=3×7=21

b=5k=7×5=35

c=7k=7×7=49

Verificare:21+35+49=105