SOLUTION: to stay in shape, julie goes running three times a week. on wednesday, she ran 3 mi less than on monday. on friday, she ran twice as far as she ran on wednesday. if she ran 21 mi a

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Question 478086: to stay in shape, julie goes running three times a week. on wednesday, she ran 3 mi less than on monday. on friday, she ran twice as far as she ran on wednesday. if she ran 21 mi altogether, how far did she run on friday.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let x= The miles she ran on Monday
given:
On Wednesday, she ran
+x+-+3+
On Friday she ran
+2%2A%28x+-+3%29+
and
+x+%2B+x+-+3+%2B+2%2A%28x+-+3%29++=+21+
+2x+-+3+%2B+2x+-+6+=+21+
+4x+-+9+=+21+
+4x+=+30+
+x+=+7.5+
On wed:
+x+-+3+=+4.5+
On fri:
+2%2A%28x-3%29+=+2%2A%287.5+-+3%29+
+2%2A4.5+=+9
She ran 7.5 mi on Mon,
4.5 mi on Wed
9 mi on fri