Bacteria in a Test Tube
A scientist has a test tube containing bacteria. Every second, each bacterium splits into two. After two hours, the test tube was completely full of bacteria. How long before that was the test tube exactly half full?
Difficulty level (1 very easy - 10 very hard): 1
Topics:
Arithmetic
Logic
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Reasoning / Logic
Algebra
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Sequences
Algebra
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Word Problems
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Solving Word Problems "From the End" / Working Backwards
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