Question 588374
Let x = number infected last year


So if the amount increased by 25%, then we add 0.25x to the original amount x to get the final amount 35000


This means we have the equation 


x+0.25x = 35000


Now solve for x


x+0.25x = 35000


1.25x = 35000


x = 35000/1.25


x = 28000



So <font color="red">28000</font> people were infected last year.

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