12 लड़कों की औसत आयु 10 वर्ष है इनमें से 11 लड़कों की औसत आयु 9 वर्ष है 12 वे लड़के की आयु ज्ञात करें
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34
Answer:
11 years...
Step-by-step explanation:
...
Total age is = 12×10=120 years
11 boys have avaerge age is 9 years
Total age is = 11×9= 99 years
The age of twelth bay is = 120-99=21 years...
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