Quantitative Aptitude :: Problems on Numbers - Discussion

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Explanation:
Lets assume total number of boys = y
Total number of girls = x
Given:
Equal number of girls and boys
=> x/y=1/1 => x = y
If 12 girls are entered out,
=> x-12 = x/2
=> x=2x-24 => x=24
So, girls x=24 and boys y=x=24
So, total number of students = x+y
=> 24+24 => 48