Question

Yesterday, Eve ran a mile in 10 minutes. Today, she ran a mile in 7 minutes. What is the percent decrease in the time it takes her to run a mile?

Answer 1

Apply simple rule of 3

10 minutes ---> 100%

 7 minutes ---> x

We multiply by cross, and

10 * x = 7 * 100

$\mathsf{x} = \mathbf {\frac{7 * 100}{10}= 7 * 10 = 70}$

Now we will subtract both percentages (100 and 70) to identify how much Eve decreased in running a mile

100% - 70% = 30%

The answer to your math homework is: Eve decreased the time it takes to run a single mile by 30%.

Answer 2

The percent decrease in the time is 30%.

Percentage :

Given that ,

Yesterday, Eve ran a mile in 10 minutes. Today, she ran a mile in 7 minutes.

The decrease in time is, $=10-7=3minute$

the percent decrease in the time is,

                             $=\frac{3}{10}*100=30$

Thus, the percent decrease in the time is 30%.

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