Question

It has been estimated that a student’s final grade in a course decreases by 5 points for every 2 days absent from class. If a student misses 4 days, by how many points will the student’s final grade decrease?

Answer 1

10 points, 2 times 4 equals 10 points.

Answer 2

For this case we can make the following rule of three:

5 points --------------> 2 days

x -----------------------> 4 days

From here, we clear the value of x.

We have then:

$x =\frac{4}{2} * (5)$

$x = 2 * 5\\x = 10$

Answer:

The student's final grade will decrease about:

x = 10 points