There is a batch of chemical fertilizer in the warehouse. The first time we took out 12.5 tons, the second time we took out two fifths more than the first time, and there are still 17 fifths left 1. There is a batch of chemical fertilizer in the warehouse. 12.5 tons were taken out in the first time. Two fifths more fertilizer was taken out in the second time than in the first time, and there are still 17 fifths left. How many tons are there in this batch of chemical fertilizer? 2. A canal has been excavated for one third of the whole site. If another 10 meters is excavated, it will reach the midpoint. How many meters is the total length of the canal?

There is a batch of chemical fertilizer in the warehouse. The first time we took out 12.5 tons, the second time we took out two fifths more than the first time, and there are still 17 fifths left 1. There is a batch of chemical fertilizer in the warehouse. 12.5 tons were taken out in the first time. Two fifths more fertilizer was taken out in the second time than in the first time, and there are still 17 fifths left. How many tons are there in this batch of chemical fertilizer? 2. A canal has been excavated for one third of the whole site. If another 10 meters is excavated, it will reach the midpoint. How many meters is the total length of the canal?

1. For the second time, 12.5 * (1 + 2 / 5) = 17.5 tons was taken
This batch of chemical fertilizer is (12.5 + 17.5) / (1-17 / 20) = 30 / (3 / 20) = 200 tons
2. 10 / (1 / 2-1 / 3) = 10 / (1 / 6) = 60m

The warehouse has 10 tons of chemical fertilizer, 1 / 5 of the total in the first time and 2.5 tons in the second time. How many tons of chemical fertilizer are there in the warehouse?
To list

5 tons

There is a batch of goods in the warehouse. 15% of the goods were transported in the first day. The next day, 8 tons more than the first day. There are still 3 / 5 of the total weight of this batch of goods. How many tons of this batch of goods are there

80 tons, you can set the unknown sequence equation
With X tons
Then X-15% X - (15% x + 8) = 3 / 5x
The solution is x = 80

192240288 largest convention
And the least common

The maximum is 48 and the minimum is 2880

Number reasoning 2,5,13,38, () a.121 b.116 c.106 d.91

B116
The difference between the preceding numbers is 3, 8 and 25
The power of 3-0 = 3
The second power of 3-1 = 8
The third power of 3 - 2 = 25
So the next one is
The fourth power of 3 - 3 = 78
38+78=116

What should be in number reasoning 1,2,3 / 2,8 / 3,15 / 8, () ()? Please explain in detail
Alternative answers a.53/15, b.52/15, c.49/15, d.48/15

In brackets, it should be 16 / 5, that is, item D 48 / 15
1 times 2 = 2
2 times 3 / 2 = 3
2 / 3 times 8 / 3 = 4
8 / 3 times 15 / 8 = 5
15 / 8 times (16 / 5) = 6
Multiply the preceding term by the following term to form the arithmetic sequence: 2, 3, 4, 5, 6

0,5,0,4,26,61, () number reasoning problem,

The sum of the intervals is:
0、9、26、65、（124）
Original sequence:
1、8、27、64、（125）
Minus one, plus one, minus one, plus one It is amended as follows:
0、9、26、65、（124）
So, 26 + (98) = 124
The answer is 98

Figure reasoning problem solving!
This is a number reasoning problem. According to the number sequence provided below, observe the arrangement rule, and then choose the most reasonable one from the four alternative answers
Sequence: 2.12.36.80
A100 B125 C150 D175
You'd better tell us what is the arrangement rule between the series! I'll give you all the points as a thank you

c
The first number: 2 * 1
The second number: 3 * 4
The third number: 4 * 9
The fourth number: 5 * 16
The fifth number: 6 * 25 = 150
The nth number: (n + 1) n ^ 2 (n ^ 2 is the square of n)

Number reasoning: 2, - 6,8, - 4, - 8, a 12 b 16 C 20 d 24

-2*[2+(-6)]=8
-2*[-6+8]=-4
-2*[8+(-4)]=8
-2*[-4+(-8)]=24
General term formula: an + 2 = - 2 * (an + an + 1)

12, - 4,8, - 32, - 24768,
Number reasoning

The answer is 744
Here is the rule:
12+（-4）=8
（-4）×8= -32
8+（-32）=-24
(-32)×（-24）=768
So what's next
-24+768=744