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Ben had 1/5 as many books as Jann. After Jann gave Ben 4 books, Ben had 1/3 as many books as Jann. How many books did Jann have in the end?

 May 28, 2021
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Initially

  b = 1/5 j

 

then

b+4   = 1/3 (j-4)     sub in the first equation

1/5 j + 4 = 1/3 (j-4)

4 + 4/3 = 1/3j - 1/5j

j = initially = 40                      then she gave away 4   to have 36 books at the end

 May 28, 2021

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