The average age of 30 students in a class
is 12 years. If another 6 students whose
average age is 15 years are also joined
in this class, now the average age of all
students is? explain answer
Answers
Answered by
0
Answer:
Total student age= 30×12=360
Another student age =6×15=90
Step-by-step explanation:
total age = 360 +90=450
total student= 30+6=36
average age=450/36=12.5 answer
Answered by
0
Step-by-step explanation:
average = 12 years
average of extra students =15
extra students average = 15-12 = 3 years more than average of present students
increase in years = 3×6 =18
increase in overall average years of total students =
18/(30+6) = 18/36 = 1/2 = 0.5
average of all students = 12+0.5 = 12.5
alternatively:
30×12 +(6×15) 360+90 450
___________ = _______ = ____ = 12.5
(30+6) 36 36
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