Respostas

2014-06-27T16:45:04-03:00
Basta seguir o desenvolvimento:

\frac{x+1}{20}=\frac{x}{15} => 20x = 15x+15 => 20x-15x=15 => 5x = 15

x = 15/5 => x = 3

Keep Moving.
  • Usuário do Brainly
2014-06-27T16:47:30-03:00
(x + 1)/20 = x/15
(x + 1) . 15 = 20 . x
15x + 15 = 20x
15x - 20x = - 15
- 5x = - 15 . (- 1)
5x = 15
x = 15/5
x = 3