It is 1 1/30.
9/10 + 4/15 is same as 27/30 + 8/30 = 35/30 = 7/6 = 1 1/6
7/10 minus 9/15 is 1/10
8 tenths plus 1 third = 9
4
3/10 + 8/15 = 9/30 + 16/30 = 25/30 = 5/6
9/10 minus 9/15 is 3/10
It is 1 1/30.
3/10 = 9/30 and 2/15 = 4/309/30 + 4/30 = 13/3013/30
12 fifteenths (sure?)19 fifteenths = 10 fifteenths (2/3) + 9 fifteenths (3/5)
1 whole
9 tenths