BECE Mathematics 2026 Paper

Concept:Find the number of rotten mangoes as a percentage of the total, then subtract it from the total.Given:Total mangoes = 20, rotten = $20\%$.Solution:Rotten mangoes $= 20\% \text{ of } 20 = \dfrac{20}{100} \times 20 = 4$Not rotten $= 20 - 4 = 16$Shortcut:If $20\%$ are rotten, $100\% - 20\% = 80\%$ are good: $\dfrac{80}{100} \times 20 = 16$.Key point: 4 (option A) is the number of rotten mangoes, not the good ones.Answer:Option D (16)