The mean age of 6 boys in a class is 12. Three new boys are admitted to the class. If the mean age of the class is now 13, what is the sum of the ages of the three new boys?
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The mean age of 6 boys in a class is 12. Three new boys are admitted to the class. If the mean age of the class is now 13, what is the sum of the ages of the three new boys?
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Answer:
Correct answer is 11 years
Description for Correct answer:
According to the question,
Average = 20×12+5×725
= 240+3525
= 27525 = 11 yrs
Step-by-step explanation:
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Verified answer
ANSWER
Step-by-step explanation:
sum of age before three boys =》12×6
=72
sum of age after three boys =》 13×9
=117
therfore, the sum of age of three boys are
117-72=45yrs