Question

A scientist notes the bacteria count in a petrie dish is 50. Two hours later, he notes the count has increased to 80. If this rate of growth continues, how much more time will it take for the bacteria count to reach 100?

Answer 1

In 2 hrs ( 120 min ) no.of bacteria increase = 80-50=30

For 30 bacteria = 120 min

For 1 bacteria = 120/30

For 100 bacteria =120/30×100

=400 min

6 hrs 40 min