AlgebraEasy–MediumAges from a relationship
Algebra practice question
A brother is 3 years older than his sister. Four times the brother's age is 60. What is the sum of their ages?
Answer: 27
Brother: 60 ÷ 4 = 15. Sister: 15 − 3 = 12. Sum: 27.
Common wrong answers
- If you answered 12
- 12 is the sister's age alone.
- If you answered 15
- 15 is the brother's age alone.
- If you answered 33
- 33 adds 3 to the brother's age for the sister instead of subtracting.
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