Question

calcule os valores de a e b,sabendo que a+b = 30 e que a/b = 4/5​

Answer 1

a/b = 4/5

a+b/b = 4+5/5

30/b = 9/5

9b = 150

b = 150/9 = 50/3

a =30-b=30 -50/3 =90-50/3 =40/3