After reading you should realize that Caroline is the youngest. Therefore, we need to find Caroline's age, and NO-ONE else's.



Let Caroline’s age be C

Then Colin’s is: C + 3, and Paul’s is: C + 3 + 12 = C + 15

We then get: C + C + 3 + C + 15 = 87

3C = 69

C, or Caroline is: 

That's IT!! 

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