SOLUTION: The 3 Jones sisters are all 5 years apart in age. The total of their 3 ages is 21 years. What is the age of the youngest sister ?

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Question 867238: The 3 Jones sisters are all 5 years apart in age. The total of their 3 ages is 21 years. What is the age of the youngest sister ?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
x+%2B+%28x%2B5%29+%2B+%28x%2B10%29+=+21
3x + 15 = 21
3x = 6
x = 2
They are: 2, 7 and 12 years old