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?
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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?
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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:
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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