SOLUTION: sierra and her brother jarred collect foreign coins. Sierra has twice the number of coins the jarred has. Together they have 105 foreign coins. Find how many coins Sierra has.

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Question 1141592: sierra and her brother jarred collect foreign coins. Sierra has twice the number of coins the jarred has. Together they have 105 foreign coins. Find how many coins Sierra has.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = number that Jarred has
+2x+ = number that Sierra has
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(1) +x+%2B+2x+=+105+
(1) +3x+=+105+
(1) +x+=+35+
and
+2x+=+2%2A35+
+2x+=+70+
Sierra has 70 coins
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check:
(1) +x+%2B+2x+=+105+
(1) +35+%2B+70+=+105+
(1) +105+=+105+
OK