AlgebraHardPriya's age from a relation and a sum
Algebra practice question
Priya is 4 years older than her cousin Ravi. Three times Ravi's age plus Priya's age equals 28. How old is Priya?
Answer: 10
With Ravi's age r and Priya's r + 4: 3r + r + 4 = 28 gives 4r = 24, so r = 6 and Priya is 10.
Common wrong answers
- If you answered 4
- 4 is the age difference.
- If you answered 6
- 6 is Ravi's age.
- If you answered 7
- 7 solves 4r = 28, forgetting the 4.
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