If you spend 90,000 yuan to buy 50 TV sets of three models at the same time, design the purchase plan.
Let a A, b, c, c=(50-a-b), right.
1500 a+2 100 b+2500(50-a-b)= 90000
Get 4b+ 10a=350.
Because both A and B are integers within 50, the unit of product of 10a is 0.
Therefore, the product unit number of 4b must also be 0, so it can be obtained
Scheme 1, b=0, a=35, c= 15.
Scheme 2, b=5, a=33 and c= 12.
Scheme 3: B = 10, A = 3:b= 10, c=9.
Scheme 4: B = 15, a=29 and c=6.
Option 5: b = 20, a=27 and c=3.
Scheme 6: b = 25, a=25 and c=0.
One ***6 schemes!