Hi,

20,000 bacteria are present in a culture 2 hours after beginning with 15,000 bacteria.  that is 5,000 new bacteria in 2 hours

Setting up the proportion, letting x represent the amount of growth in 15hr



cross multiply to solve

2x = 15*5000

x = 37,500 growth in 15hr

Total bacteria:  15,000 + 37,500 = 52,500 

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