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)
+781 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.
