45, 60, and 75
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18, 20 and 22
They are 14, 16 and 18.
The numbers must total 888/8 ie 111. The middle number is 1/3 of 111 ie 37 so the three numbers are 36, 37 and 38 and multiples are 288, 296 and 304.
-10 and -11.
Their sum is three times the middle number.