121. A battery had enough charge to light 10 bulbs for a certain period of time.
After 10 minutes of usage, 2 bulbs were disconnected from the battery. All the
balance bulbs remained powered up just as long as before. How long was that?
(a) 30 minutes (b) 50 minutes (c) 60 minutes (d) 40 minutes
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Answer:
The remaining 8 bulbs are powered up 50 minutes
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