Answer:
75% solution: 350ml
25% Solution: 150ml
Step-by-step explanation:
[tex]\left \{ {{\frac{3}{4}x+\frac{1}{4}y =\frac{3}{5}500ml} \atop {x+y=500ml}} \right.[/tex]
working on first equation:
[tex]3x+y=4(300ml)[/tex]
substitute second equation on the first equation:
3x+500ml-x=1200ml
2x=1200ml - 500ml
x= 350 ml
subtitute this result on the second equation:
350ml + y = 500 ml
y = 150 ml
to prove the results:
substitute both values on first equation:
[tex]\frac{3}{4}*350ml + \frac{1}{4}*150ml =[/tex]
[tex]= 262,50ml + 37,50ml =\\[/tex]
= 300 ml of pure acid
in 500ml solution = 300ml/500ml = 60% concentration
