Question

Calcule o calor de x nas proporções:a) x-3/x=4/5
B)x-3/18=1/2
C)2/1=15-x/x
D)6/10=x/x+2

Answer 1

a)

(x - 3)/x = 4/5

5x - 15 = 4x

5x - 4x = 15

x = 15

b)

(x - 3)/18 = 1/2

2x - 6 = 18

2x = 24

x = 12

c)

2/1 = (15 - x)/x

15 - x = 2x

3x = 15

x = 5

d)

6/10 = x/(x + 2)

10x = 6x + 12

4x = 12

x = 3