WAEC Mathematics 2017 Paper

Concept:Forming a linear equation from the total share and the relation between boy and girl shares.Explanation:Let each girl's share be $x$.Then each boy's share is $x + 20$, since a boy takes ₦20 more than a girl.There are 4 girls and 5 boys.Total sum shared is ₦18,100.So, $4x + 5(x + 20) = 18{,}100$.$4x + 5x + 100 = 18{,}100$.$9x + 100 = 18{,}100$.$9x = 18{,}000$.$x = \frac{18{,}000}{9} = 2{,}000$.Each girl gets ₦2,000.Therefore, each boy gets $2{,}000 + 20 = 2{,}020$.Answer:A boy's share is ₦2,020.00.Correct option: C.