Help me solve the Olympiad puzzle, hurry!!

That is, 3 people work together to complete two tasks.

900 + 1250 = 2150 trees ......The total number of two tasks.

2150 (24+30+32) = 25 days ......The three-person team takes a total of 25 days.

25 24 = 600 trees ......The number of trees completed in 25 days.

900-600) 30 = 10 days ......The number of days that B worked in aland.

10+1=11 days ......B should move from place A to place B on the 11th day after the commencement.

Set x days after B to b y days to complete.

So: 24y+30x=900

32y+30(y-x)=1250

So, x=10

A, B and C have been planting trees at the same time from the beginning to the end, indicating that they have planted trees together:

900 + 1250) (24 + 30 + 32) = 25 (days) A tree planting: 24 * 25 = 600 (trees).

Then B plants trees in place A: (900-600) 30=10 (days) so B goes to place B on day 11.

Let it take x days in total, and B will go to place B on day y:

List the system of equations by the title:

24x+30t=900

32x+30(x-t)=1250

The sum of the two formulas gives 86x=2150 x=25

Lending t=10

1000 Red + 100 Yellow + 10 White + Blue 70 Red 70 Yellow 70 White 70 Blue Isn't the right question? If 10 white and 70 white cannot be cancelled, then there will be no result of "no matter what number is on the white card, the result is 1998".

It should be 10 times.

That is, 100 red + 10 (red + yellow) blue = 222

It can be seen that the hundred place corresponds, then red is 2, then 10 yellow and blue = 2, blue represents one digit, and the sum of 2 is a multiple of 10.

If the blue is 8, the yellow is 1

The three cards of red, yellow, and blue are respectively .

Because the difference between the four digits and the sum of his numbers is 70 times = 1998 mantissa = blue - 0 = 8 blue = 8

Let the whites be 0 and 1 respectively

Red Yellow 08 - (Red + Yellow + 0 + 8) * 70 = 1998 Red Yellow 18 - (Red + Yellow + 1 + 8) * 70 = 1998 Red Yellow 18 - Red Yellow 08 = 70 10 = 70 Assumptions are wrong.

The sum of 70 times the number is 0 at the end, and 1998 is added to get four digits, then there is a number of 8

The maximum is 9, 8, 7, 6 is 30

70 times up to 2100

The four-digit maximum is more than 4,000.

When the white card is here, the number is x*10 to the k-power.

x*70=x*10 to the kth power, then this question is wrong.

Of course, if I understand the question incorrectly, I can understand it.

Can the landlord be sure that the title is correct?