AlgebraHardNumber from a half of a difference
Algebra practice question
Half of the difference between three times a number and 4 is 25. What is the number?
Answer: 18
(3n − 4)/2 = 25 gives 3n − 4 = 50, so n = 18.
Common wrong answers
- If you answered 27
- 27 solves 3n/2 − 4 = 25, halving only the 3n.
- If you answered 50
- 50 is 3n − 4.
- If you answered 15.33
- 15.33 solves 3n − 4 = 25 without doubling.
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