A number reasoning problem of civil servants: 14,24,12,0, () options have 2,3, - 3, - 5 and explain the law

A number reasoning problem of civil servants: 14,24,12,0, () options have 2,3, - 3, - 5 and explain the law

-5
2^4-2=14
3^3-3=24
4^2-4=12
5^1-5=0
6^0-6=-5

1 / 12,2,7 / 6,10 / 3,14 / 9, () a.199/18 b.293/21 c.365/24 d.467/27

14 / 9 is 44 / 9, 1 / 12 * 2 + 1 = 7 / 6, 2 * 7 / 6 + 1 = 10 / 3, 7 / 6 * 10 / 3 + 1 = 44 / 9, 10 / 3 * 44 / 9 + 1 = 467 / 27
If the title is really wrong, choose D

Number reasoning 1,15,8,24,27,35,64,48 what are the next two numbers

125,63.
1 = 1 to the third power; 8 = 2 ^ 3; 27 = 3 ^ 3; 64 = 4 ^ 3; so 125 = 5 ^ 3;
15 = 3 * 5; 24 = 4 * 6; 35 = 5 * 7; 48 = 6 * 8; so 63 = 7 * 9

Red scarf farm raised 120 ducks, the number of ducks is 2.5 times that of chickens. How many chickens are raised in the farm?

Chicken: 120 / 2.5 = 48

The farm raised 74 chickens, more than 5 / 6 of the ducks. How many ducks are there

Let X be the number of ducks,
74=5/6X+14
60=5/6X
X=72
So there are 72 ducks

There are 2400 chickens, ducks and geese in the farm. The number of geese accounts for 1 / 3 of the number of chickens, ducks accounts for 1 / 2 of the number of chickens and geese, and chickens account for 5 / 7 of the number of ducks and geese,

Let X be for chicken, y for duck and Z for goose
X+Y+Z=2400.(1)
3Z=X+Y.（2）
2Y=Z+X.（3）
Substituting (2) into (1) gives z = 600
X+Y=1800.(2)
Deform (3) to 2y-x = 600. (4)
(2) + (4) gives y = 800
Substituting y = 800 into (4) yields x = 1000

There are 2400 chickens, ducks and geese in the farm. The number of geese is 1 / 3 of that of chickens and ducks. The number of ducks is 1 / 2 of that of chickens and geese. The number of chickens is 5 / 7 of that of ducks and geese

The algorithm is as follows: let chicken be a, duck be B, goose be C, then a + B + C = 2400, a = 5 / 7 (B + C) B = 1 / 2 (a + C) C = 1 / 3 (a + b) substitute equation 4 into equation 3, B = 1 / 2 [a + 1 / 3 (a + b)], B = 4 / 5A; then substitute equation 3, B = 4 / 5A, 4 / 5A = 1 / 2 (a + C), C = 3 / 5A

The number of chickens in the poultry farm is two-thirds of that of ducks and four fifths of that of geese. There are 2400 ducks and how many geese

Geese = 2400 × 2 / 3 △ 4 / 5 = 1600 × 5 / 4 = 2000

There are 400 chickens, 100 less than ducks. How many percent of ducks are chickens? How many percent are ducks? How many percent are chickens less than ducks? How many percent are ducks more than chickens?

Duck: 400 + 100 = 500
400÷500=80%
Chickens account for 80% of ducks
500÷400=125%
Ducks make up 125% of chickens
（500-400）÷500=20%
Chicken is 20% less than duck
（500-400）÷400=25%
Ducks are 25% more than chickens

If the number of chickens is 1 / 5 less than that of ducks, the number of ducks is several percent more than that of chickens

Multiple = 1 / 5 ÷ (1-1 / 5) = 25%