Question 178652
ok lets call the amount of 30% and 70% batch a and b respectively
:
x+y=10............eq 1   because there is 10 liters altogether
:
.3x+.7y=.6(10)....eq 2
:
rewrite eq 1 to x=10-y and plug that value into eq 2
:
.3(10-y)+.7y=.6(10)
:
3-.3y+.7y=6
:
.4y=3
:
{{{highlight(y=7.5)}}}liters of 70% batch
:
{{{highlight(x=10-7.5=2.5)}}}liters of 30% solution