allery48 વિદ્યાર્થીઓમાં, છોકરાઓ સરેરાશ 64, છોકરીઓ 76, બધા 69 ગુણ. છોકરીઓની સંખ્યા?
A28
B18
C16
D20
Answer & Solution
Correct answer: D. 20
જો g એ છોકરીઓની સંખ્યા છે, તો 64(48 −g) + 76g = 69 × 48 g = 20 આપે છે.
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