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How many rodents are there if after every 4 days, the number of rodents becomes same again?

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The population of rodents in a house doubles every day.
Every day 25 rodents are killed.
How many rodents are there if after every 4 days, the number of rodents becomes same again?

posted Jan 16 by Swati Arora

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1 Answer

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25


Initial amount- x
Day 1---> 2x-25
Day 2---> Day1 * 2 - 25 = 4x-75
Day 3 ---> Day2 *2 - 25 = 8x-175
Day 4---> Day3 *2 - 25 = 16x-375 = x -> 15x=375 ->x=25

answer Jan 16 by Hanifa Mammadov



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