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?	Choose the correct choice
A) 5  B) 6  C) 7  D) 8  E) 9
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. ==&gt; 7 cars with a spare tire   Answer 7
<result>C</result>
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?