2004 AMC 8 Problems/Problem 12
Problem
Niki usually leaves her cell phone on. If her cell phone is on but
she is not actually using it, the battery will last for hours. If
she is using it constantly, the battery will last for only
hours.
Since the last recharge, her phone has been on
hours, and during
that time she has used it for
minutes. If she doesn’t talk any
more but leaves the phone on, how many more hours will the battery last?
Solution
When not being used, the cell phone uses up of its battery per hour. When being used, the cell phone uses up
of its battery per hour. Since Niki's phone has been on for
hours, of those
simply on and
being used to talk,
of its battery has been used up. To drain the remaining
the phone can last for
more hours without being used.
See Also
2004 AMC 8 (Problems • Answer Key • Resources) | ||
Preceded by Problem 11 |
Followed by Problem 13 | |
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