There are 600 children on a field. 30% of them were boys. After 5 teams of boys joined the children on the field, the percentage of children who were boys increased to 40%.
How many boys were there in the 5 teams altogether?
190​

imagine me knowing the answer

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the answer is solomon northrup. he was a free-born african american, abolitionist and professional violinist that was drugged, kidnapped and sold as slave in 1841 and remained in captivity until 1853 where he regained his freedom with the of the then-governor of new york, washington hunt. he wrote and published his memoirs "twelve years a slave" in 1853, and in this text, he tells the story of his escape thru one of louisiana's swamps (the great pacoudrie swamp) in which he ended up covered in green slime from crossing the surface of the dead water.