In 6 / 15, 2 / 15, 4 / 25, 2 / 3 Of these four fractions, the one that can be reduced to a finite number is

In 6 / 15, 2 / 15, 4 / 25, 2 / 3 Of these four fractions, the one that can be reduced to a finite number is

4 out of 25 = 0.16

2^6-6*25+15*2^4-20*2^3+15*2^2-6*2+1
If the answer is right, continue to add

=64-150+1.5×16-20×8+15×4-12+1
=64-150+24-160+60-12+1
=64+24+60+1-150-160-12
=（64+24+60+1）-（150+160+12）
=149-322
= -173

A number reasoning problem
1 2 3 2 () 6 A, 2 3 B, 3 C, 33 D, 5 answer D

1 + 2 = 3 (the third term is 3 + 2 = 5 (the fifth term is 115 + 6 = 11)

1,2,2,3,4,6, () number reasoning problem
Please give the specific steps

9
Last digit = sum of first two digits - 1

In a farm, there are 1500 chickens and ducks. One quarter of the chickens are 15 less than 40% of the ducks. How many chickens and ducks are there?
I want the process!

In fact, only one yuan is enough. If x ducks and (1500-x) chickens are in a farm, the equation can be obtained as follows: (1500-x) * 1 / 4 = 40% - 15 375-x / 4 = 0.4x-15 x = 600, 1500-600 = 900. Therefore, there are 600 ducks and 900 chickens

The ratio of chickens to ducks in the farm is 8:3. There are 1500 more chickens than ducks. How many chickens and ducks are there in the farm
Powder urgent!

8-3=5
1500/5=300
Chicken 300 * 8 = 2400
Duck 300 * 3 = 900

Uncle Wang raised 45 chickens and ducks, four fifths of which were chickens. How many ducks did he raise?

45÷(1+4/5)
=25 pieces

The number of ducks raised by Uncle Wang is 20% less than that of chickens

Chicken is the whole 1, then duck is 1-20% = 80%
Their ratio is:
Chicken: Duck = 1: (1-20%) = 5:4

In a farm, there are 1200 ducks, and the number of chickens raised is 3 / 5 more than that of ducks. How many chickens are there

Number of chickens: 1200 + 1200 × 3 / 5 = 1920
Quantity relation: the number of chickens = the number of ducks + the number of ducks × 3 / 5

Uncle Zhang's family has 24 ducks, three fifths more ducks than chickens, and how many more ducks than chickens

Number of chickens = 24 (1 + 3 / 5) = 24 × 5 / 8 = 15
More ducks than chickens = 24-15 = 9