Answer:
Step-by-step explanation:
Let k be the constant of proportionality. Then we use it as follows:
2k + 3k = 500, or 5k = 500, or k = 100.
Thus, the number of picture books is 2(100) = 200, and the number of chapter books is 3(100) = 300.
As checks: 200 + 300 = 500 (books), and
200
-------- = 2/3, as specified in the problem.
300
