AlgebraHardThird of three stepped numbers
Algebra practice question
The sum of three numbers is 120. The second number is 5 more than the first, and the third is 5 more than the second. What is the third number?
Answer: 45
n + (n + 5) + (n + 10) = 120 gives 3n = 105, so n = 35 and the third is 45.
Common wrong answers
- If you answered 35
- 35 is the first number.
- If you answered 40
- 40 is the second.
- If you answered 50
- 50 adds 5 once too often.
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