A number reasoning problem: 28 18 32 14 36 10 ()

A number reasoning problem: 28 18 32 14 36 10 ()

forty
28-10=18
18+10+4=32
32-10-4-4=14
14+10+4+4+4=36
36-10-4-4-4-4=10
10+10+4+4+4+4+4=40

Number reasoning question 29 10? 28

19
X modulo 2 is the remainder of X divided by 2. That is to say, odd modulo 2 equals 1 and even modulo 2 equals 0
So 10 = 9 + 2-9 module 2 = 9 + 2-1
19 = 10 + 9-10 module 2 = 10 + 9-0
28 = 19 + 10-19 module 2 = 19 + 10-1

Number reasoning: 1,4,27, (), 3125

The first is the first power of one, followed by the second power of two, the third power of three, and the fifth power of five after the brackets. We must fill in the fourth power of four, which is 256

Given polynomial a = x ^ 2-xy + y ^ 2; b = x ^ 2 + XY + y ^ 2 (1), find 2a-2b

2A-2B
=2(x²-xy+y²)-2(x²+xy+y²)
=2x²-2xy+2y²-2x²-2xy-2y²
=-4xy

There is a column for chickens and ducks. Chickens are half of ducks. Eight ducks are flying. Six chickens are laying eggs. The number of ducks is three times that of chickens

Suppose there are x chickens, then there are 2x ducks
2X-8=3(X-6)
2X-8=3X-18
X=10
2X=20
A: there are 10 chickens and 20 ducks

Uncle Wang's family has 78 chickens and ducks. One eighth of the chickens are sold, which is 3 less than the number of ducks. How many chickens and ducks does Uncle Wang's family have

Suppose there are x chickens and Y ducks
There are 78 chickens and ducks in total, so x + y = 78
One eighth of the chicken is sold, so there are seven eighths left, three less than the duck
So 7 / 8x = Y-3
Combining two formulas, we get x = 40, y = 38

There are 180 chickens and ducks raised by an agricultural household, of which the number of chickens is 2 / 3 of that of ducks

180 * (2 / (2 + 3)) = 72
180-72 = 108
A: there are 72 chickens and 108 ducks

There are 180 chickens and ducks. The number of chickens is 25% more than that of ducks. How many ducks are there?

Suppose there are x ducks, then the chicken has x (1 + 25%). It is the same as x + X (1 + 25%) = 180, and the solution is x = 80, so there are 80 ducks,

There are 2880 chickens and ducks. The number of ducks is 2 / 7 of that of chickens. How many chickens and ducks are there?

There are 2 280 chickens (1 + 2 / 7)
Ducks: 2880-2240 = 640

There were 140 chickens and ducks. Later, half of the total number of chickens were sold and 40 were bought. At this time, the number of ducks was twice that of chickens. How many chickens and ducks were there?

Suppose there were x chickens and 140 ducks
2× x/2＝140－x＋40
x＝180－x
2x＝180
x＝90
The number of ducks: 140-90 = 50