A mother is 3 times as old as her daughter. The sum of their ages is 28. How old is the daughter?
Answer and explanation
Correct answer: A. 7
- Step 1: Let the daughter be ; the mother is , so .
- Step 2: and .
Answer
7.
Why not the others: 21: that is the mother's age. 14: the ages are split equally. 8: the sum is divided by the multiple only.
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