Question

Suma a doua nr e 99 si raportul lor e 4/5

Answer 1

a+b=99

a/b=4/5 rezulta ca a=bx4/5

bx4/5 +b=99

aduci la acelasi numitor peste tot

4b+5b=495

9b=495

b=55

a= 99-55= 44

Answer 2

a + b = 99 → suma

a / b = 4 / 5 ⇒  5 a = 4 b ⇒  a = 4 b / 5

_______________________________

4 b / 5 + b = 99

4 b + 5 b = 5 × 99

9 b = 5 × 99  l   : 9

b = 55

a = 99 - 55 ⇒  a = 44

Verific:  44 + 55 = 99 → suma ;    44 / 55 = 4 / 5 → raportul