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Hello. 

The mixed number fraction 15/3 should be multiplied by the fraction 3/15 to equal the required number 1.

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irspow
It should be multiplied by its reciprocal, mathematically:

nr=1   the product of a number and its reciprocal is one.  In this case:

(15/3)r=1  multiply both sides by 3

15r=3  divide both sides by 15

r=3/15

r=1/5