Answer :

There are 5 "parts" and 3 "parts"; which total "8 parts" (5 + 3 = 8); so, each part must be 56/8 = 7. so each part must be 56/7 = 8 
5 x 7 is 35
3 x 7 is 21 
___________
So the answer is 35:21 .

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