16Hit1600
Advanced MathEasy–MediumAdding fractions with a variable denominator

Advanced Math practice question

For x ≠ 0, the sum 1/x + 1/(2x) can be written as k/(2x), where k is a constant. What is the value of k?

Answer: 3

1/x = 2/(2x), so the sum is 2/(2x) + 1/(2x) = 3/(2x).

Common wrong answers

If you answered 1
1 comes from 1/x + 1/(2x) = 1/(3x), adding denominators.
If you answered 2
2 adds the numerators without converting 1/x.
If you answered 4
4 doubles both numerators.

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