A 70
B 85
C 75
D 100
Correct Answer: Option C
ধরি, ছাত্র-ছাত্রী সংখ্যা=x
শর্তমতে, x(x+25)=7500
or, x2+25x-7500=0
or, x2+100x-75x-7500=0
or, x=75
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