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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