According to the meaning, 30X= 1 100+400.
The solution is x = 50m/s.
Set up a general factory to produce X thousand tents and a branch factory to produce Y thousand tents.
X+Y=9
1.6X+ 1.5Y= 14
The solution is x = 5 and y = 4.
Suppose that X people are assigned to produce bolts and Y people are assigned to produce nuts.
X+Y=24
12X/2= 18Y/3
X= 12,Y= 12。
Let's assume that x people are transferred to place A and y people are transferred to place B.
X+Y=20
27+X=2( 19+Y)
The solution is X= 17.
Y=3
Let the aircraft speed be Xkm/h when there is no wind.
( 17/6)(26+X)=3(X-26)
The solution is x = 9 10 km/h 0 km/h.