BECE Mathematics 2020 Paper

Members in the club $=$ No. of females + No. of malesConceptNo. of $A$ : No. of $B=$ Ratio of $A: B$$\Rightarrow$ No. of females: No. of males $=3: 2$No. of females $=15$$\Rightarrow 15$ : No. of males $=3: 2$Express the : as fractions$\Rightarrow \frac{15}{\text{No}}$. of males $=\frac{3}{2}$ Cross multiply (The numerator from one side multiplies the denominator from the other side of the equation)No. of males $\times 3 = 15 \times 2$Make No. of males the subject by dividing both sides of the equation by 3No. of males $=\frac{15 \times 2}{3}$3 goes into 15, 5 times$\Rightarrow$ No. of males $=5 \times 2 = 10$Members in the club $=$ No. of females + No. of males$\Rightarrow$ Members in the club $=15+10=25$