Given that 1/f = 1/u + 1/v , express u in terms of v and f

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Which equation and solution can be used to solve this problem? thirteen less than a number is sixteen. 13-n=16: add 13 to both sides. the answer is 29. n+13=16: subtract 13 from both sides. the answer is 3. n+16=13 subtract 13 from both sides. the answer is 3. n-13=16: add 13 to both sides. the answer is 29.

Which of the greatest common gcf of 32 and 48 a 16 b 96 c 8 d 32