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Question

The average age of a group of nine students is 18 years. When a new student is added to the group, the average age of the group increased by 0.5 years. Find the age of the new student. नौ छात्रों के एक समूह की औसत आयु 18 वर्ष है। जव समूह में एक नया छात्र सम्मिलित किया जाता है, तो समूह की औसत आयु 0.5 वर्ष बढ़ जाती है। नये छात्र की आयु ज्ञात करें।

A
19 years

19 वर्ष
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B
23 years

23 वर्ष
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C
20 years

20 वर्ष
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D
20.5 years

20.5 वर्ष
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Solution

The correct option is B 23 years 23 वर्षLet the age of the new student be x years 18 × 9 + x = 18.5 × 10 ⇒ X = 23 years. माना कि नए छात्र की आयु x वर्ष है। ∴ 18 × 9 + x = 18.5 × 10 ⇒ x = 23 वर्ष

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