15x+35( 160-x) 1260

Solution: 65 < x < 68

Because x is an integer, x=66 or 67.

That is, there are two schemes: 1) 66 A, 94 B 2) 67 A and 93 B.

2) Profit of scheme 1: 5*66+ 10*94= 1270.

Profit of scheme 2: 5*67+ 10*93= 1265.

So the most profitable plan is A 66 and 94.