Question 1117050
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Sam has  7x,  while Colin has  5x,


and the difference is  7x - 5x = 3200,  or  2x = 3200,  which implies  x = {{{3200/2}}} = 1600.


<U>Answer</U>.  Sam has  £1600*7 = £11200.  Colin has  £1600*5 = £8000. 
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Solved.