A number reasoning problem: 2, 3, 6, 9, 18, ()

A number reasoning problem: 2, 3, 6, 9, 18, ()

27 and 45 make sense
Odd sequence and even sequence are equal ratio sequence, common ratio of 3 is 27
If you calculate the difference, the difference sequence is 1,3,3,9. The rule is that the latter number is equal to the product of the former two numbers, then the next number is 3 * 9 = 27, and you get 45

Ask civil servants for a number reasoning problem 8,4,2,2,1（
8,4,2,2,1, () what should be filled in the numbers in brackets?

2
Multiplication of the last two equals the first

Number reasoning 2 6 13 24 41 ()

6*6+32=36+32=68

The number of chickens raised by Uncle Li is more than 60% of the total number of chickens and ducks. There are 200 ducks in 60. How many chickens are there altogether?
Formula calculation

Then, the number of ducks is the total number of chickens and ducks (1-60%) = 40%, less than 60
There are 200 ducks
Therefore, the total number of chickens and ducks = (200 + 60) △ 40% = 650
Therefore, there are 650-200 chickens = 450
Formula: (200 + 60) △ 1-60%) - 200 = 450

Li Ming's family has 35 chickens, 5 less ducks than chickens. What's the percentage of ducks in chickens?

(35-5) △ 35 = 30 △ 35 = 67 A: the number of ducks accounts for 67.5% of the number of chickens

Granny Zhang's family has 150 chickens and ducks. The number of chickens is five times that of ducks?

Duck: 150 (5 + 1) = 25; chicken: 25 × 5 = 125

Uncle Li's family has 20 chickens and 15 ducks. The number of chickens raised by Uncle Li's family is ()% of that of ducks

133%

Uncle Li has 240 chickens and ducks in total. It is known that the number of chickens is three times that of ducks. How many chickens and ducks are there respectively? (use the equation)

Suppose there are 3x chickens,
There are x ducks
3x+x=240
x=60
There are 180 chickens
There are 60 ducks

1. Mr. Li has 24 geese. The number of geese is one third of that of ducks. The number of ducks is three eighths of that of chickens. How many chickens does Mr. Li have?
2. A water beam has been built for 600 meters, accounting for two-thirds of the total length of this water beam. How many meters is the total length of this water beam?

Uncle Li raised 192 chickens
The total length of this water beam is 600 △ 2 / 3 = 900 meters

The ratio of chicken to pig is 26:5, the ratio of sheep to duck is 25:9, and the ratio of pig to duck is 10:3. Calculate the ratio of chicken to sheep

Because chicken: Pig = 26:5 = 260:50, pig: Duck = 10:3 = 50:15; so chicken: Duck = 260:15; because sheep: Duck = 25:9 = 125:45, chicken: Duck = 260:15 = 780:45; so chicken: sheep = 780:125 = 156:25