AlgebraHardNumber from a doubled and a third relation
Algebra practice question
When a number is doubled and 7 is subtracted, the result equals 3 more than one third of the number. What is the number?
Answer: 6
2x − 7 = x/3 + 3. Multiplying by 3 gives 6x − 21 = x + 9, so 5x = 30 and x = 6.
Common wrong answers
- If you answered 2
- 2 uses 6x − 21 = x + 3 without multiplying the 3 by 3.
- If you answered 3
- 3 solves x/3 = 1.
- If you answered 10
- 10 subtracts 7 on the wrong side.
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