SOLUTION: Sam has already biked 1/4 of all the distance and 12 miles, and he still needs to bike 3/8 of the total distance and 9 miles. What’s the total distance?

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Question 1036446: Sam has already biked 1/4 of all the distance and 12 miles, and he still needs to bike 3/8 of the total distance and 9 miles. What’s the total distance?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Let d = total distance in miles.
==> %28d%2F4%2B+12%29+%2B+%28+%283d%29%2F8+%2B+9%29+=+d
==> %285d%29%2F8+%2B+21+=+d
==> %283d%29%2F8+=+21 ==> d = 56 miles, the total distance.