The average age of 5 students is 9 years . out of them the ages of 4 students are 5,7,8 and 15 years .what is the age of the remaining students.

10 years

Step-by-step explanation:

Let the age of the remaining student be x years.

The age of the remaining student = 10 years

Step-by-step explanation:

Let the age of the remaining student = x

Average age of 5 students  = 9 year

Sum of the age of 5 students  = 9*5 = 45 years

5 + 7 + 8 + 15 + x = 45

               35 + x = 45

                        x = 45 - 35

                        x = 10

The age of the remaining student =  10 years

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