Question

The average age of a class of 20 students
is 15 years. When they are mixed with
another section havin@o students, the
average age of the class becomes 14
years. What is the average age of the 10
students of the second section?​

Answer 1

Answer:

12

Step-by-step explanation:

20( number of students)×15(average age of the 20 students) =300( Total age of 20 students)

The second section has 10 students.

so,

20+10= 30( Number of students) × 14( average age of the 30 students)= 420(Total age of 30 students)

now the difference between the Total age is 420-300=120

The Total age of 10 students are 120.

Now the average is 120/10= 12