Answer:
14
Explanation:
Start by finding the average number of cars owned by both boys:
52 + 24
------------ = 76/2 = 38.
2
Subtract 24 from 38, obtaining 14. Adding 14 cars to Jon's 24 yields 38 cars.
Adding 14 to this 38 yields 52 (which verifies that this math is correct).
Jason should give Jon 14 cars. The the two boys would have the same number of cars.