Multiple choice

The average age of 40 students of a class is 15 years. When 10 new students are admitted, the average is increased by 0.2 years. The average age of the new students is - एक कक्षा में 40 छात्रों की औसत आयु 15 वर्ष है। जब 10 नये छात्र प्रवेश लेते है तो औसत में 0.2 वर्ष की वृद्धि हो जाती है। नये छात्रों की औसत आयु है-

  1. 15.2 years

  2. 16.0 years

  3. 16.2 years

  4. 15.8 years

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total age of 40 students = 40 * 15 = 600 years. After adding 10 students, total = 50 * 15.2 = 760 years. Sum of new 10 students' ages = 760 - 600 = 160. Their average = 160/10 = 16 years.