There are 360 story books and literature books in the library. The number of story books is one fourth more than literature books. How many story books are there?

If there are x story books, there are (360 - x) literature books
x-(360-x)=1/4(360-x)
2x-360=90-1/4x
4/9x=450
x=200
360-200 = 160
A: there are 200 story books and 160 literature and art books

There are 96 literature books, science books and story books in the library. It is known that science books are one third of story books and one fourth of literature books

Suppose there are x books of science and technology. Therefore: (3 / 1) x + (1 / 4) x + x = 96 (3 + 4 + 1) x = 96 x = 96 / 8 x = 12 subjects; 12x3 = 36 articles; 12x4 = 48

A and B leave from a and B at the same time and meet at a distance of 6km from the midpoint of the two places. It is known that the speed of car a is five sixths of that of car B, so they meet each other
How many kilometers did car a travel?

Yiduo walked 6x2 = 12km
The speed ratio is 5:6
The distance ratio is 5:6
When they meet, a walks 5 / (5 + 6) = 5 / 11
B left 6 / 11
12 △ 6 / 11-5 / 11) = 12 △ 1 / 11 = 132 km
132x5 / 11 = 60km
Dajia car line 60 km

The waist length of an isosceles triangle is 2 √ 5cm, and the bottom length is 2 √ 2cm

Height = √ (20-2) = 3 √ 2cm;
Area = (1 / 2) × 3 √ 2 × 2 √ 2 = 6 square centimeter;
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In △ ABC, the sum of a and B is just twice that of C, and B is 30 ° larger than A. can you work out B? Explain the reason

A=B-30
A + B = 2C means 2b-30 = 2C means C = B-15
In addition, a + B + C = 180, that is, b-30 + B + B-15 = 180, so B = 75

To celebrate "July 1st", class 4 (1) is going to dress up the classroom. They are going to hang a lantern every 1 meter on both sides of the classroom (both ends should be hung). The monitor measures out the length of the classroom as 8 meters. How many lanterns do they need to buy?

8 △ 1 + 1 = 9 (pieces), answer: need to buy 9 lanterns

The area ratio of a square and a circle with equal perimeter is ()
A. 1：2B. 2：1C. 1：1D. π：4

Suppose that the circumference of the circle and square is 16, then the radius of the circle is: 16 △ π △ 2 = 8 π, the area is: π × 8 π × 8 π = 64 π, the side length of the square is: 16 △ 4 = 4, the area is: 4 × 4 = 16; so the area of the square: the area of the circle = 16:64 π = π: 4, so choose: D

If x.y is a positive integer, and the x power of 2 multiplied by the Y power of 2 = 32, (1) the X-1 power of 2 and the y plus 1 power of 2
Finding positive integers x, y satisfying the condition

=32
（1,4）（2,3）

A circle with a diameter of 4cm is reduced into an approximate rectangle. The length of the approximate rectangle is () cm, the width is () cm, and the area is ()

Length = half of circumference = 3.14 × 4 △ 2 = 6.28 cm
Width = radius = 4 △ 2 = 2cm
Area = circle area = 3.14 × (4 △ 2) &# 178; = 12.56 square centimeter

As shown in the figure, a rectangular cardboard can just be made into a cylinder. Find the volume of the cylinder

Length of rectangle = circumference of cylinder bottom surface + 2 diameters = diameter of cylinder bottom surface × 3.14 + 2 × diameter of cylinder bottom surface
So the diameter of the bottom of the cylinder is
20.56 ÷ (3.14 + 2) = 4 (CM)
What is the base radius of the cylinder
4 △ 2 = 2 (CM)
What is the volume of a cylinder
2 × 2 × 3.14 × 4 = 50.24 (cm3)

There are 360 story books and literature books in the library. The number of story books is one fourth more than literature books. How many story books are there?