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The average age of a class is 19 years. While the average age of boys is 20 and the average age of girls is 17. If the number of boys is 20 then find the number of girls in the class
  • a)
    10
  • b)
    15
  • c)
    16
  • d)
    18
  • e)
    None of these
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The average age of a class is 19 years. While the average age of boys ...
Answer – 1.10 Explanation : Average of class = 19 = Sum/(b+g) sum (girls) = g*17 sum (boys) = b*20 19b + 19g = 17g + 20b 2g = b = 20. So girls = 10
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Community Answer
The average age of a class is 19 years. While the average age of boys ...
let number of girls be g 
sum of boy's ages= 20*20=400
sum of girl's ages= 17*g=17g
19 = 400 +17g / 20+g
380+19g= 400+17g 
g=10
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The average age of a class is 19 years. While the average age of boys is 20 and the average age of girls is 17. If the number of boys is 20 then find the number of girls in the classa)10b)15c)16d)18e)None of theseCorrect answer is option 'A'. Can you explain this answer?
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