﹛x+2y=230①
﹛2x+y=205②
①×2
2x+4y=460③
③-②
3y=255
y=85
∴x=60
A: .............................
(2)( 1575-5×60)÷85= 15
A: ...................................
(3) Establish and reform Class A schools and reform Class B schools (6-a).
﹛ 10a+ 15(6-a)≥70 ④
﹛50a+70(6-a)≤400⑤
From ④
10a+90- 15a≥70
-5a≥-20
a≤4
Starting from ⑤
50a+420-70a≤400
-20a≤-20
a≥ 1
∴ 1≤a≤4
∫a is an integer
∴a= 1,2,3,4
Scheme 1: 1 A school and 5 B schools.
Scheme 2: There are 2 Class A schools and 4 Class B schools.
Scheme 3: There are 3 Class A schools and 3 Class B schools.
Scheme 4: There are 4 Class A schools and 2 Class B schools.
Hand-beating