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31
When Bob is charging, the two-digit number on his display screen indicates how long
his battery has been charging. You can calculate the number of minutes Bob has
spent charging by multiplying this number by 10. Note that the number starts from 0
every time Bob is put to charge, regardless of how full his battery is. For example, if
his screen shows the number 24, that means Bob has been sitting to charge for 240
consecutive minutes (4 hours).
Charging Time
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