The answer will depend on the units. 20 mm x 8 mm is quite a different size from 20 miles x 8 miles.
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If: x+8 = 20 Then: x = 12
0.4 x 20 = 8
The lowest common multiple of 8 and 20 is 40. 8 x 5 = 40 and 2 x 20 = 40.
20 x 8% = 1.60 20 + 1.60 = 21.60
Adding a % and a whole number: Example: 50% of 20 + 8 = 50% x 20 + 8 = 0.50 x 20 + 8 = 10 + 8 = 18