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Eric had 7 times as many markers as Andy. After Eric gave Andy some of his markers, each boy then had 36. How many markers had Eric given to Andy?

 May 13, 2021
edited by Tgfromthe4  May 13, 2021
 #1
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7/9 of 108 is 84 so 108-84 is 24 so that means 24 coins are quarters

 May 13, 2021
 #2
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e = 7a

 

then

e-s  = 36    and   a+s = 36        where 's'  is 'some'

e = 36+s              a = 36 -s       sub these into the red equation

 

36+s = 7 ( 36-s)

s = 27

 May 13, 2021

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