SOLUTION: Twins diana and riana are each 6 years older then their youngest brother kyle. Togather, their ages total 21 years. How old is kyle?

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Question 1092894: Twins diana and riana are each 6 years older then their youngest brother kyle. Togather, their ages total 21 years. How old is kyle?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let Kyle's age = +x+
Diana and Riana's age is +x+%2B+6+
Add up their ages
+x+%2B+2%2A%28+x+%2B+6+%29+=+21+
+x+%2B+2x+%2B+12+=+21+
+3x+=+9+
+x+=+3+
Kyle is 3
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check:
+x+%2B+2%2A%28+x%2B6+%29+=+21+
+3+%2B+2%2A%28+3+%2B+6+%29+=+21+
+3+%2B+2%2A9+=+21+
+3+%2B+18+=+21+
+21+=+21+
OK