Question

The average age of a class of 40
boys is 11.95 years. The average of
the class is raised to 12 years by the
coming of a new boy. How old is this
new boy?​

Answer 1

Answer:

41*12-40*11.95=14

Step-by-step explanation:

Earlier 40 students,total age= 40*11.95=478

New no of students 41,total age= 41*12=492

age of new student is=492-478=14

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Step-by-step explanation:

Answer 2

Answer:

Average age of 30 students=9

Total age of 30 students = 30 ×9=270 (1)

Average including teacher (31 person, 30 students + 1 teacher) =10

Total age including teacher=31×10=310

Age of 30 students + age of teacher =310

By(1) Replace Age of 30 students with 270

270 + Age of teacher = 310

Age of teacher =310–270=40. Ans….

Step-by-step explanation:

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