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Math problem of senior one (good score! ! ! ! ! ! ! ! ! ! ! ! ) hurry up! ! !
1

Solution: Let's assume that everyone has to stack X paper cranes.

Then: 40x=(40- 10)*(x+8)

40x=30x+240

10x=240

x=24

A: The class was scheduled to stack 24 paper cranes per class.

2

Solution: Let the average speed from Beijing to Wuhan be x km/h.

Then: 15x=8x+(7-4)*(2x+50)

15x=8x+3*(2x+50)

15x=8x+6x+ 150

15x= 14x+ 150

x= 150

A: The average speed from Beijing to Wuhan is150km/h.

Then: the average speed from Wuhan to Guangzhou after the speed increase is: 2* 150+50=300+50=350.

hope this helps

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