9/10 + 4/15 is same as 27/30 + 8/30 = 35/30 = 7/6 = 1 1/6
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3/10 + 8/15 = 9/30 + 16/30 = 25/30 = 5/6
4/9 plus 7/15 = 41/45 in its simplest form
12 fifteenths (sure?)19 fifteenths = 10 fifteenths (2/3) + 9 fifteenths (3/5)
9 tenths
It is 1 1/30.