Question 323155
Let {{{c}}} = pounds of corn she needs to add
given:
{{{.9*28 = 25.2}}} pounds of oats
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Note that {{{.2016 + .798 = .9996}}}, so there
is .04% of something else
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(oats)/(oats + corn) = 20.16%
{{{25.2/(28 + c) = .2016}}}
{{{25.2 = .2016*(28 + c)}}}
{{{25.2 = 5.6448 + .2016c}}}
{{{.2016c = 19.5552}}}
{{{c = 97}}}
She should add 97 pounds of corn