Answer:
5/6 is the desired ratio.
Explanation:
That ratio would be
5
------
4
============
3
------
2
To divide by 3/2, invert 3/2 and multiply 5/4 by 2/3 instead:
5 2
------ * ------ = 10/12, or 5/6.
4 3
The ratio of the areas of Brown's acreage to Smith's is 5/6.