Mathematics learning plan and evaluation answer 4.3 Solving problems with equations (2)

1. Xiaohong is the school basketball star. In one game, he scored 23 points (excluding free throws). If he hit four fewer three-pointers than two-pointers, how many two-pointers and three-pointers did he hit?

2. A cargo ship has a deadweight of 400 tons and a volume of 860m3. There are two kinds of goods to be loaded now, pig iron and cotton. The volume of pig iron per ton is 0.3m3, and the volume of cotton is 4m3. How many tons of pig iron and cotton should be loaded separately to make full use of the load and volume of this ship?

A computer company AB sold 2200 computers of two brands the year before last. Last year, the number of computers A increased by 6% and the number of computers B decreased by 5%. The total sales of the two computers increased by 1 10. Last year, A scored X two-pointers and (x-4) three-pointers.

2x+3(x-4)=23

5x =35

x =7

7-4=3 (pieces)

Two points, seven points, three points, three points.

Set x tons of pig iron and (400-x) tons of cotton.

0.3x+4(400-x)=860

3.7x =740

x =200

400-200=200 (ton)

200 tons of pig iron and 200 tons of cotton

Solution: Set up a computer X and B (2200-x).