2. Let the prices of Party A and Party B be 7X and 3X respectively. According to the meaning of the question, the equation can be listed:
(7X+70):(3X+70)=7:4
7(3X+70)=4(7X+70)
2 1X+490=28X+280
X=30
A: 7*30=2 10.
3*30=90
3. The increased surface area is 2 (length * width) +2 (length * height) =200.
Length * width+length * height = 100
Length * (width+height) = 100
The sum of width and height is long, so length * length = 100, length = 10.
Width 10/4=2.5
Height 2.5*3=7.5
V=2.5*7.5* 10= 187.5
This question can be said to be not very strict. Because the cutting methods of transverse cutting and vertical cutting are different.