Question

A coastal geologist estimates that a certain countrys beaches are eroding at a rate of $1.5$ feet per year.

According to the geologists estimate, how long will it take, in years, for the countrys beaches to erode

by $21$ feet?

• A. $14$ years
• B. $12$ years
• C. $8$ years
• D. $15$ years

Answer 1

The correct option is A $14$ years

If the beaches are eroding at the rate of 1.5 feet per year, then for eroding by 21 feet, it will take $\frac{21}{1.5}=14$ years