Call the number of marbles that Harry had, x........so, Peter had (4/5)x
So
x - 8 = (4/5)x + 11 add 8 to both sides, subtract (4/5)x from both sides
(1/5)x = 19 multiply both sides by 5
x = 95 = the number of marbles that Harry had, at first
And Peter had (4/5)x = (4/5)*95 = 76
Proof.....
Harry started with 95 and gave away 8 = 87
Peter started with 76 and received 11 = 87
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