48 ছাত্রদের মধ্যে, ছেলেদের গড় 64, মেয়েরা 76, সমস্ত 69 নম্বর। মেয়েদের সংখ্যা?
A28
B18
C16
D20
Answer & Solution
Correct answer: D. 20
যদি g হয় মেয়েদের সংখ্যা, 64(48 −g) + 76g = 69 × 48 দেয় g = 20।
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