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The class average score of a Mathematics score is 91.The average score of the girls is 89 and the average score of the boys is 92.5.There are 24 girls in the class.Find the number of boys.(algebra)

 Jul 21, 2020
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There are 24 girls and their average score is 89. Their total score is 24*89=2136. Let x be the number of boys. We form an equation for the average score.

 

(2136+92.5x)/(24+x)=91

2136+92.5x=2184+91x

1.5x=48

x=32 boys.

 Jul 21, 2020

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