Question

A wooden plank of length x is cut into 8 sections such that each section is at most 2 1/2 meters long. What is the length of the entire plank in meters?

a x ≤ 3.2 meters
b x ≤ 20 meters
c x ≥ 10.5 meters
d x ≥ 20 meters

Answer 1

b

Explanation:

Answer 2

`\bf 2(1)/(2)\implies \cfrac{2\cdot 2+1}{2}\implies \cfrac{5}{2} \\\\\\ \textit{now, 8 sections that long?}\qquad 8\cdot \cfrac{5}{2}\implies 20 \\\\\\ x\le 20`