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10 व्यकतीयो वाले परिवार की औसत आयु 20 वर्ष है। यदि परिवार के सबसे छोटे सदस्य की आयु 10 वर्ष है, तब परिवार की औसत आयु सबसे छोटे सदस्य के जन्म के समय ज्ञात करे ?A. `27.14 years`B. `12.5 years`C. `14.27 years`D. `11(1)/(2) years` |
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Answer» Correct Answer - D According to the question Average age of a family of 10 members is =20 years Sum of the age of 10 members =20 x 10 =200 years If the age of youngest member is =10 years Sum of the age of 9 members at the time of birth of youngest member =200-10 x 10 =200-10 =100 years `therefore` Average of 9 members is =`100/9=11 1/9` years |
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