Question

me ajuda alguem por favor quem puder​

Answer 1

a) 25
b) 20
c) 12
d) 90

Answer 2

A)

$\frac{x}{20} = \frac{5}{4}$

4x = 5·20

4x = 100

X = 100/4

X = 25

B)

$\frac{1}{3} = \frac{x}{60}$

3x = 60

X = 60/3

X = 20

C)

$\frac{2}{3} = \frac{20 - x}{x}$

2x = 3·(20-x)

2x = 60 - 3x

2x + 3x = 60

5x = 60

X = 60/5

X = 12

D)

$\frac{7}{3} = \frac{(x + 1)}{39}$

3(x+1) = 7·39

3x + 3 = 273

3x = 273 - 3

3x = 270

X = 270/3

X = 90