(1) A product produces X pieces, and B product produces 50-x pieces.

So you need:

A: 9x+4 (50-x) < =360.

B: 3x+ 10 (50-x) < =290

(2)

9x+4(50-x)& lt； =360

9x+200-4x & lt； =360

5x & lt= 160

x & lt=32

3x+ 10(50-x)& lt； =290

3x+500- 10x & lt； =290

7x & gt=2 10

x & gt=30

30 & lt= x & lt=32

So x = 30,365,438+0,32.

50-x=20， 19， 18

So there are three kinds.

A30 pieces, B20 pieces

A3 1 piece, B 19 pieces.

A32 pieces, B 18 pieces