Wang Hua bought five copies of "interesting mathematics" and "Story King" respectively, with a total cost of 20 yuan. Each copy of "interesting mathematics" is 2.6 yuan. How much is each copy of "Story King"?

Wang Hua bought five copies of "interesting mathematics" and "Story King" respectively, with a total cost of 20 yuan. Each copy of "interesting mathematics" is 2.6 yuan. How much is each copy of "Story King"?

20 △ 5-2.6, = 4-2.6, = 1.4 (yuan); a: 1.4 yuan for each story king

The school bought back 300 literature books and popular science books. The ratio of literature books and popular science books is 3:2. How many of them are there?
The formula

Let X
3x+2x=300
5x=300
x=60
Literature book: 60x3 = 180
Popular science books: 60x2 = 120
A

If the volume of the metal block is 500 cubic centimeters and the mass is 1350 grams, the density of the metal block is 0_____ G / cm3, i.e_____ Kg / m3. If half of the metal block is cut off, half of the density left is 0______ Kg / m3

Then its density is___ 2.7__ G / cm3, i.e__ 2700___ Kg / m3. If half of the metal block is cut off, half of the density left is 0___ 2700___ Kg / m3

1.5 is 12. Add, subtract, multiply and divide in the middle,
This is the problem my friend gave me. He said that there can be an answer. I've been working for a long time. If you can give me a standard answer, I'll add another 50 points

1(5+5)/5=12

The area of the triangle formed by the function y = - 2 / 3x + B and the coordinate axis is 12
Finding the value of B

When x = 0, y = B, and when y = 0, x = 3 / 2B
It is known that the area of the triangle formed by the function and the coordinate axis is 12,
1 / 2 × B × 3 / 2B = 12;
So B × B = 16;
The solution is b = - 4 or B = 4

The side area of a cylinder is 100 square meters, the bottom radius is 4 meters, what is its volume?

A: its volume is 200 cubic meters

3 5 7 minus 13 is 24 points,

[7-(-13)×5]÷3=24

If x = 2T, y = 3T is the solution of the system of equations x-6y + 16 = 0, then what is the value of T?

Substituting x = 2T, y = 3T into x-6y + 16 = 0
2t-18t+16=0
16t=16
t=1
If you have any mistakes, please correct them,

How many square meters is a thousand square inches
How much is 1.36 yuan per square meter equivalent to per thousand square inches?

1 inch = 2.54 cm = 0.0254 M
1 square inch = 0.0254 × 0.0254 = 0.00064516 square meters
1 square meter = 1550.00 square inches
1.36 yuan / m2 = 2.108 yuan / thousand square inches

As shown in the figure, in the triangle ABC, the angle a is equal to 30 degrees, the angle AC is equal to 2 times the root 3, and the length of AB is calculated?

The conditions are not enough