4/12 + 3/15 = 4x1/4x3 + 3/15
= 1/3 + 3/15
= 1x5/3x5 + 3/15
= 5/15 + 3/15
= 8/15
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Given that: 12/3 = 4 15/3 = 5 12/15 = 4/5
3/5 x 5/12 x 4/15 = 3 x 5 x 4/5 x 12 x 15= 5 x (3 x 4)/5 x 12 x 15= 1/15
3/5 - 3/4 = 12/20 - 15/20 = (12 - 15)/20 = -3/20
4/5 - 1/3 = 12/15 - 10/15 = 2/15
11 over 12 + 1 over 3= 11 over 12 + 4 over 12 = 15 over 12 or 1 and 3 over 12 or 1 and 1 over 4