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In a parking lot, there are some cars with a spare tire others don't. All together there are 43 tires and 9 cars. How many cars have a spare tire?

It is a multiplication problem 

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Danny T. | A Computer Engineer for Math tutoring (Algebra to Calculus)A Computer Engineer for Math tutoring (A...
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Let's assume we are talking about 4 wheels car only.  
 
9 cars, 4 tires per car, 9 x 4 = 36 tires.
 
There are total of 43 tires, 43 - 36 = 7 extra tires.
 
Let's assume each car has only one spare tire. ==> 7 cars with a spare tire