A class A school = 205-145 = 600,000 yuan.
Class A and B school = 230-145 = 850,000 yuan.
(2) If it is known that there are no more than 6 Class A schools in this county, how many Class A schools and Class B schools are there respectively?
When A= 1, b = (1575-60) ÷ 85 =17.8 (inconsistent with the question).
When A=2, b = (1575-60× 2) ÷ 85 =17.1(not in line with the question).
When A=3, b = (1575-60× 3) ÷ 85 =16.4 (not in line with the question).
When A=4, b = (1575-60× 4) ÷ 85 =15.7 (not in line with the question).
When A=5, b = (1575-60× 5) ÷ 85 =15 is the correct answer.