2002 AMC 8 Problems/Problem 18
Problem
Gage skated hr min each day for days and hr min each day for days. How long would he have to skate the ninth day in order to average minutes of skating each day for the entire time?
Solution 1
Converting into minutes and adding, we get that she skated minutes total, where is the amount she skated on day . Dividing by to get the average, we get . Solving for , Now we convert back into hours and minutes to get .
Solution 2
For the first five days, each day you are minutes short of minutes. And for the next three days, you are minutes above minutes. So in total you are missing , which equals to negative . So on the ninth day, to have an average of minutes, Gage need to skate for minutes, which is minutes, or .
Video Solution
https://www.youtube.com/watch?v=Ea1C64_qBH4 ~David
See Also
2002 AMC 8 (Problems • Answer Key • Resources) | ||
Preceded by Problem 17 |
Followed by Problem 19 | |
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