Question 1143081
x, females
y, males
{{{system(x+y=100,(70x+60y)/100=63)}}}

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{{{7x+6y=630}}}
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{{{system(7x+6y=630,6x+6y=600)}}}
{{{E1-E2}}}:
{{{x=30}}},{{{meaning}}}{{{that}}} {{{y=70}}}


Forty more female students than male students.