The number of people needed per hectare of crops and the cost per hectare of crops
Rice for 4 people and rice for 45,000 yuan.
Cotton 5 people cotton 75,000 yuan
If the estimated gross output value p (ten thousand yuan) meets 105≤P≤ 120, how should this farm arrange the planting area of rice and cotton?
Let the area of rice be x and the area of cotton be y.
X+Y=20
4X+5Y & lt； = 100
105<P=4 .5X Seventh anniversary of the conference. 5Y< 120
105<4.5 +7.5 times (20 times)< 120
105< 150-3x & lt； 120
-45 & lt； -3x & lt； -30
∴ 10<； x & lt 15
X and y are integers, so there are the following schemes:
1)X= 1 1，Y=9， 1 1 * 4+9 * 5 = 89 & lt； 100
2)X= 12，Y = 8； 12 * 4+8 * 5 = 88 & lt； 100
3)X= 13，Y = 7； 13 * 4+7 * 5 = 87 & lt； 100
4)X= 14，Y = 6； 14 * 4+6 * 5 = 86 & lt； 100
(2)
Analysis:
The equivalent relationship is: 400× number of units shipped from Beijing to Wuhan +800× number of units shipped from Beijing to Chongqing +300× number of units shipped from Shanghai to Wuhan +500× number of units shipped from Shanghai to Chongqing =7600. Just substitute the correlation value into the solution.
Answer:
Solution: If Beijing is shipped to Wuhan X, Beijing will be shipped to Chongqing (10-x), Shanghai will be shipped to Wuhan (6-x) and Shanghai will be shipped to Chongqing (x-2).
400 x+800×( 10-x)+300×(6-x)+500×(x-2)= 7600，
The solution is x=6,
∴ 10-x=4，
6-x=0，
x-2=4。
A: Beijing shipped 6 sets to Wuhan, Beijing shipped 4 sets to Chongqing, Shanghai shipped 0 sets to Wuhan and Shanghai shipped 4 sets to Chongqing.