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14 Nov 2005, 17:43
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Q: The girls' average score is 30. The boys' average score is 24. If there are twice as many boys as girls, what is the overall average?
I have the answer, but I am not sure how to get it. Can someone elaborate please? Thanks...
I have the answer, but I am not sure how to get it. Can someone elaborate please? Thanks...
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14 Nov 2005, 20:36
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Let there are x girls
So there are 2x boys
sum of scores of all girls = 30 * x
sum of scores of all boys = 24 * 2x
Avg of whole class = total score / tota students
= (30x + 24*2x) / (x+2x)
So there are 2x boys
sum of scores of all girls = 30 * x
sum of scores of all boys = 24 * 2x
Avg of whole class = total score / tota students
= (30x + 24*2x) / (x+2x)
14 Nov 2005, 21:58
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Q: The girls' average score is 30. The boys' average score is 24. If there are twice as many boys as girls, what is the overall average?
(30x + 48x)/3x = 78/3 = 26
(30x + 48x)/3x = 78/3 = 26
