x+(3x+2000)= 10000
4x=8000
x=2000
Therefore, the number of items requiring rough machining is 2000 kg.
(2) Let warehouse A store X tons of grain and warehouse B store Y tons of grain.
The score is not easy to write, three fifths is written as 0.6, and two fifths as 0.4.
x+y=450
x-0.6x=y-0.4y
X-0.6x = y-0.4y-0.4x = 0.6y-4x = 6y-x =1.5y-substitute x+y=450.
x+ 1.5x=450 - 2.5x=450
x= 180
y=270
Therefore, warehouse A originally stored grain 180 tons, and warehouse B originally stored grain of 270 tons.
0.6x+0.4y = 108+ 108 = 2 16 & gt； 200
So this transfer can meet the needs of warehouse C.