133 is the HCF
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No, it's 10, the largest number minus the smallest number. 665-655=10
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30% of 665= 30% * 665= 0.3 * 665= 199.5
13.49% of 665= 13.49% * 665= 0.1349 * 665= 89.7085
This has an infinity of solutions: 1 x 665, 2 x 332.5, -1 x -665, etc. If you want integers, since the number ends with 5, it is obvious that 5 is one of the factors.