How many liters of a 12% salt solution must be added to 10 liters of a 25% salt solution to get a 20% salt solution ?

There must be added 6.25L of a 12% salt solution

Step-by-step explanation:

We add  ‘x’ litres of 12% salt solution into 10 litres of 25% salt solution, so resulting in “x+10” litres of 20% salt solution.

x litres  of 12% salt solution  + 10 litres 25% salt solution = (x+10) litres 20% salt solution

this gives us the formula:  

x(12) + 10(25) = (x+10)20

12x + 250 = 20x +200

-8x = -50

x=6.25

Therefore add 6.25 litres of 12% salt solution to 10 litres of 25% salt solution to obtain a 20% salt solution.

sadsadsadsad

step-by-step explanation:

i think it might be a but you might want a second opinion