0.375, depending...
The Q has two interpretations, thus two solutions.
If "11 over 8" is intended to mean a fraction, then the problem is posited:
1x - 11/8x = - 3/8x. (1 of something is negative 3/8 bigger than 11/8 of that thing; 11/8 of something exceeds 1 of something by 3/8 . . .which is the equivalent of 0.375 as stated previously. )
But, if "11 over 8" connotes the excess of 11 over 8--the difference between 11 and 8--then the problem would be posited:
(11x - 8x) - 1x = 3x - 1x = 2x. (11 less 8 of something is "bigger" by 2 than 1 of something.)
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