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12.) During the first 3 weeks of training, a runner runs 20 miles, 22 miles, and 21 miles. How many miles must she run during the fourth week to have
a mean of at least 22 miles per week?
10 miles
15 miles
20 miles
25 miles

Respuesta :

anyjah1
The answer is 25 miles.
20+22+21+25=88
88 divided by 4 is 22.

She just run 25 miles in the 4th week

Since the runner wants to have an average of 22 miles per week in 4 weeks, then the total miles that she must run will be:

= 22 × 4

= 88 miles

We will then add the total number of miles for the first 3 weeks. This will be:

= 20 + 22 + 21

= 63 miles

Then, the number of miles needed for the 4th race will be:

= 88 miles - 63 miles

= 25 miles

Therefore, she must run 25 miles in the 4th week.

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