allery48 شاگردوں میں، لڑکوں کے اوسط 64، لڑکیاں 76، تمام 69 نمبر۔ لڑکیوں کی تعداد؟
A28
B18
C16
D20
Answer & Solution
Correct answer: D. 20
اگر g لڑکیوں کی تعداد ہے، 64(48 − g) + 76g = 69 × 48 دیتا ہے g = 20۔
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