3/15 = 1/5
So the question becomes 3/5 - 1/5 which is 2/5.
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3/5 minus 2/15 is 7/15.
2 fifths is 6 fifteenths, so 7 fifteenths minus 6 fifteenths is 1 fifteenth.
Find the "common denominator". 2/5 is 6/15. So 1 fifteenth minus 6 fifteenths is minus 5 fifteenths , or minus one third
14/15 - 2/5 = 8/15