तीन लड़कियों की औसत आयु 20 वर� – McqOptions

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1.	तीन लड़कियों की औसत आयु 20 वर्ष है तथा उनकी आयु 3:5:7 के अनुपात में है \| सबसे छोटी लड़की की आयु है ?
A.	2
B.	6
C.	12
D.	10
Answer» D. 10

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