8 +10 18 -7 11 +10 21 -7 14 +10 24 -7 17 +10 27 -7 20 +10 30 and so on.
Each unbold number shown above is either an increase of ten, or a subtraction of 7.
The +10 and -7 are the figures that form the pattern.
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7/8 of 21 is 18 3/8
18/8 = 22/8 which simplifies to 21/4
11/18 - 1/6 = 11/18 - 3/18 = 8/18 = 4/9
(11/18) - (1/6) = (11/18) - (3/18) = (11-3)/18 = 8/18 = 4/9
No, 935 divided by 21 is 44 with remainder 11.