Question

calcule o valor x nas proporções:
$\frac{6}{x} = \frac{9}{12}$
$\frac{2x}{3} = \frac{24}{15}$
$\frac{3}{4} = \frac{5x}{20}$
$\frac{x + 5}{3} = \frac{x - 1}{5}$

Answer 1

calcule o valor x nas proporções:

6/x = 9/12 = 3/4,  3x = 24, x = 8

2x/3 = 24/15 = 8/3 , 2x = 8, x = 4

3/4 = 5x/20 = x/4.  x = 3

(x + 5)/3 = (x - 1)/5

5x + 25 = 3x - 3

2x = -28

x = -14