Question

pliiiiiisssss
para hooooyyy

Answer 1

Respuesta:

40, 30, 28, 90, 1/4

Explicación paso a paso:

1) (1/4)x + (1/5)x=18

  (9/20)x=18

  x=40

2) (1/2)x+(1/3)x+(1/5)x=31

   (31/30)x=31

   x=30

3) (1/4)x - (1/7)x=3

 (3/28)x=3

 x=28

4) (1/3)x + (1/5)x - ( (1/4)x-(1/6)x) = 40,5

   (8/15)x-(1/12)x = 40,5

   (81/180)x=40,5

       x=90

5) (x/(x+3)).... fracción original

   (x+2/(x+5))... fracción equivalente a 1/2

    (x+2/(x+5))=1/2

    2x+4=x+5

       x=1

  (x/(x+3))=(1/(1+3))=1/4

Espero sirva, saludos!