SOLUTION: When 40 is added to the number of miles Karen ran last week, the result is the same as adding 10 to 4 times the number of miles she ran last week. How many miles did Karen run las

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Question 934735: When 40 is added to the number of miles Karen ran last week, the result is the same as adding 10 to 4 times the number of miles she ran last week.
How many miles did Karen run last week? I don't have a clue on how to even start.
Please help.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
x miles ran last week (that is what is being referred to )
x+ 40 = 4x + 10
30 = 3x
10mi = x, miles ran last week