Question 632131
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Hi,
Mark had 3 times more marbles than Isabella.  Isabella had 2/3 as many marbles as Jack's {{{highlight(x)}}} marbles 
Jack  {{{highlight(x)}}}  3
Isabella  {{{(2/3)x}}}    2
Mark       2x             6     
       {{{(11/3)x = T}}}  Jack needs to have at least 3 marbles 
 {{{11}}} or a multiple of 11 is the number of marbles there could have been.