2013 RRB Allahabad

Question 64

A virus inside a human organ can triple itself at every second Then the ratio of the number of viruses at 28 seconds and 30 seconds is

Solution

Let the number of viruses at 28seconds be x.

At 29s, it will be 3x

At 30s, it will be 9x.

Hence, the ratio is 1:9


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