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A certain bacteria colony doubles in size every day for 20 days, at which point it reaches the limit of its habitat and can no longer grow. If two bacteria colonies start growing simultaneously, how many days will it take them to reach the habitat’s limit?
A. 6.33
B. 7.5
C. 10
D. 15
E. 19
Answer: E
Source: GMAT Club Tests
A. 6.33
B. 7.5
C. 10
D. 15
E. 19
Answer: E
Source: GMAT Club Tests
