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In one season, Ana ran 18 races. This was 4 fewer races than twice the number of races Kelly ran. How many races did Kelly run?

Please help me. My math teacher gave us the classwork and homework and they were both different lessons. She said that the homework was worth 100 points and it's due tomorrow and I am really confused. 

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Arturo O. | Experienced College Instructor for Physics TutoringExperienced College Instructor for Physi...
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K = number of races than Kelly ran
 
Ana ran 18 races.  The information in the problem statement translates into algebra as
 
18 = 2K - 4
 
Solve for K.
 
18 + 4 = 2K
22 = 2K
K = 1
 
Kelly ran 11 races.