- A15
- B16
- C18
- D20
Step-by-Step Solution
Total age = . The three known ages add to 38, so the fourth is 56 − 38 = 18.
Answer: C) 18
Four siblings have an average age of 14 years. Three of them are 9, 12 and 17 years old. How old is the fourth sibling (in years)?
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