Question

1. Last week Joe ran 45 miles. This week he ran 34 miles. find the percent increase or decrease

Answer 1

Now, first we have to notice there has been a decrease:

$45-34=11$

In this case, a 11 mile decrease. Now, we can use a rule of three to calculate the percentage of those 11 miles relative to the original 45 miles run, as following:

This way,

$x=\frac{11\cdot100}{45}\Rightarrow x=24.44$

We can say that there was a 24.44% decrease