A father is three times as old as his son. In 4 years the father's age will be 6 more than twice the son's age. How old is the son now?
Answer and explanation
Correct answer: D.
- Step 1: Let the son be ; the father is . Step 2. In 4 years: , so . **Answer: . Why not the others:** gives the father's age; gives the son's age in the past; gives the son's age in the future.
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