RRB NTPC 2014 Paper

Question : 93 of 100

Marks: +1, -0

If the number of germs increases 3 times every minute, then what will be the ratio of number of germs in 30th minute to that in 32nd minute?

1 : 9
1 : 6
1 : 4
3 : 9

Validate

Solution:

(1) Let the number of germs in 30 th minute be n.
Number of germs in 31st minute will be 3n.
Number of germs in 32nd minute will be 9n.
So, the ratio of number of viruses in 30th minute to that in

32^ \nd

minute =n : 9n = 1 : 9

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