allery48 विद्यार्थियों में लड़कों का औसत 64, लड़कियों का 76, सभी 69 अंक। लड़कियों की संख्या?
A28
B18
C16
D20
Answer & Solution
Correct answer: D. 20
यदि g लड़कियों की संख्या है, 64(48 − g) + 76g = 69 × 48 g = 20 देता है।
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