During an environmental campaign on World Ozone Day, students calculated that planting $4$ trees absorbs…
During an environmental campaign on World Ozone Day, students calculated that planting $4$ trees absorbs $100\text{ kg}$ of carbon dioxide per year. How many trees must be planted to absorb $500\text{ kg}$ of carbon dioxide per year?
$12$
$16$
$20$
$25$
Solution
If $4$ trees absorb $100\text{ kg}$, then absorbing $500\text{ kg}$ requires $5 \times 4 = 20$ trees.