WAEC Mathematics 2016 Paper

Concept:The slope has a constant inclination, so the height above the ground is directly proportional to the distance walked up the slope.Explanation:The total distance walked up the slope after going 8 m and then 12 m further is:$8 + 12 = 20$ m.Let the new height above the ground be $h$ m.Using the same ratio of distance to height for the slope:$\frac{8}{3} = \frac{20}{h}$Cross-multiplying gives:$8h = 3 \times 20$$8h = 60$$h = \frac{60}{8} = 7.5$ m.Answer:$7.5$ m, i.e. option C.