allery48 विद्यार्थ्यांमध्ये, मुले सरासरी 64, मुली 76, सर्व 69 गुण. मुलींची संख्या?
A28
B18
C16
D20
Answer & Solution
Correct answer: D. 20
g ही मुलींची संख्या असल्यास, 64(48 − g) + 76g = 69 × 48 g = 20 देते.
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