SOLUTION: the average age of class of 40students is19.4. if the avaerage age of boys is 20and the total age age girls is 216,the number of girls in the clas is

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Question 1090574: the average age of class of 40students is19.4. if the avaerage age of boys is 20and the total age age girls is 216,the number of girls in the clas is
Answer by greenestamps(13216) About Me  (Show Source):
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The average age of the 40 students is 19.4, so the total of all the ages is


If the total of the boys' ages is 560 and the average age of the boys is 20, then the number of boys is
560%2F20=28

And so the number of girls in the class is
40-28=12