Respuesta :

mhanifa

Answer:

4

4

Step-by-step explanation:

x litres of 15% solution + y litres of 19% solution= 8 gallons of 17% solution

disinfectant content of the final solution= 8*0.17= 1.36 gallons

0.15x+0.19y=1.36

x+y= 8 ⇒ x=8-y

  • 0.15*(8-y)+0,19y= 1.36
  • 1.2-0.15y+0.19y=1.36
  • 0.04y=0.16
  • y= 0.16/0.04
  • y=4 gallons
  • x= 8-4= 4 gallons