Well, that's vague. 2/15 is already in simplest form, so it can't be reduced further. In decimals, 2/15 is 0.13 (the 3 repeats). Multiplying both the numerator and denominator by the same number also gives us stuff like 4/30, 6/45, and 8/60.
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2/15=0.133333333333
10/15 factor out a 5 5*2/5*3 eliminate 5; top and bottom 2/3 simplest form and equivalent
2 over 5
6 over 45
10/15 = 2/3