Answer:
48 old houses
Explanation:
First of all, every 4 new houses, there's 8 old houses. That's 4x8, therefore, if there are 8 new houses, that's 8x2, which is 16. Based on this information, this means that if there are 24 new houses, then you would have to multiply 24 by 2 to find the amount of old houses. 24x2=48. VOILA! You're done. :3