The quantity of part 1 * * is 2x.

Treatment within one hour after the efficiency is reduced (1-1/5) x = 0.8x.

Parts processed before failure: xy parts

Machining parts after failure: 160=0.8x(2+ 1/3-y)

Then: 200=7/3x-xy xy=7/3x-200.

Part 1 * *: 2x =160+xy

Bring in: 2x= 160+(7/3x-200)

So: 1/3x=40

x= 120

The number of parts is 2x=240.