For the first week of February by influenza 5% of children in kindergarten. The second week ill 9 next children, bringing the number of patients increased to 20%. How many children went to the kindergarten?

Correct result:

n =  60


5/100 n + 9 = 20/100 n

5/100•n + 9 = 20/100•n

15n = 900

n = 60

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