Hi,

Peter has 4 times as many stamps as "the number John has. 

If Peter gives 36 stamps to John, he will have 2/3 as many stamps as John.

  (2/3)(4x - 36) = (x+36)     |Multiplying thru by 3 so as all denominators = 1

     2(4x-36) = 3(x+36)

    8x - 72 = 3x + 108

     5x =  180

       x = 36, number John has.  Peter has 144.   Together they have 180.



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