Question 350130
The answer in words will be:
(ml of pure juice she ends up with)/(total ml of punch) = 48%
Let {{{x}}} = ml of pure juice in punch she added
Given:
{{{850 - 100 = 750}}} ml of 50% punch at start
{{{.5*750 = 375}}} ml of pure juice at start
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{{{(375 + x)/850 = .48}}}
{{{x/100}}} = concentration of punch added
{{{375 + x = .48*850}}}
{{{x = 408 - 375}}}
{{{x = 33}}} ml
{{{33/100 = .33}}}
The concentration of the punch she adds must be 33%