Solving math word problem on productivity calculations

25 builders have completed 1/5 of a build in 8 days. The project leader then decides that the build now must be completed in 20 days. What is the smallest number of additional builders the project leader must hire to complete the build within the new schedule?

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[parucleo]

Brings back old memories... back in the days when I used to do math homeworks in Bangladesh! Thanks for the post... now I can teach my kid :)