Question

Calcule o valor de x nas proporções.

a) x+3/4 = x+9/7

b) x+5/5 = 3x-5/10

c) x+3/3 = 20/6

Answer 1

OK, vamos lá.

a) 7. (x+3) = 4.(x+9)
7x + 21 = 4x + 36
3x = 15
x = 15/3

x = 5


b) 10.(x+5) = 5.(3x-5)
10x + 50 = 15x - 25
5x = 75
x = 75/5

x = 15


c) 6. (x+3) = 3.20
6x + 18 = 60
6x = 42
x = 42/6

x = 7


att Jhonny ♥