Question

Qe The average age of 10 students in a class is 20 years. If new student is also included, then the new average age of all the students increased by I year. The age & of new student is.​

Answer 1

Answer:

ha the answer is very simple

Step-by-step explanation:

the age of new student must be added and multiplied

Answer 2

Answer:

Let, average age of all students = x

[According to the question,]

⇒ (20 + 25)x = 20 × 10 + 25 × 12

⇒ (20 + 25)x = 20 × 10 + 25 × 12⇒ 45x = 500

⇒ (20 + 25)x = 20 × 10 + 25 × 12⇒ 45x = 500⇒ x = 500/45 = 11.111

"[Average age of all students = 11.111]"