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Popular Word Problems >

In an experiment, the population of bacteria is increasing at the rate of 100% every minute. The population is currently at 50 million. How much was the population of bacteria minute ago?

Solution

I n an e x p er im e n t, t h e p o p u l a t i o n o f ba c t er ia i s in cre a s in g a t t h e r a t e o f 100% e v ery min u t e . T h e p o p u l a t i o n i s c u rre n tl y a t 50 mi ll i o n . Ho w m u c h w a s t h e p o p u l a t i o n o f ba c t er ia min u t e a g o ?

Solution

Amount before addition : 25

Solution steps

Translate the problem into an equation:

50 = x + 1 \cdot x

50 = x + 1 \cdot x : x = 25

Amount before addition : 25

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