If those are fractions, 6/15 - 1/15 = 5/15 = 1/3
If those are expressions of time, 6:15 - 1:15 = 5 hours
If they are something else, please write them out.
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15 + 6 - 1 = 20
8/15 − 1/6 = 33/90 or 11/30
15 minus 6 divided by 2 is equal to 12.
minus 1, minus 2, minus 3, minus 4, minus 5... The next number is 6.
the answer to this problem is 3 and 3/4