' 1 ' is their only common factor.
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HCF(63, 35) = 7
35
The x stands for a number. You just have to figure out what times 35 equals 27. If you use your calculator, you can see that 27 divided by 35 equals 0.77 so that would be what X is.
27 = the cube of 3 = 54/2
7.