There are x technical books. Story books are four times as many as science and technology books. There are 450 more story books than science and technology books

There are x technical books. Story books are four times as many as science and technology books. There are 450 more story books than science and technology books

According to the meaning of the title:
4X-X =450
3X=450
x=150

There are 225 sci-tech books and storybooks in total, of which storybooks are four times as many as sci-tech books. How many sci-tech books and storybooks are there?

Science and technology book: 4x + x = 225 x = 45 story book 45 × 4 = 180 (copies) is very simple, remember to give me the best

There are 185 science and technology books and storybooks. The number of science and technology books is four times that of storybooks. How many are science and technology books and storybooks

If there are x story books, there are 4x science and technology books
x+4x=185
5x=185
x=185÷5
x=37
4x=4×37
=148

If a1 + a3 = 10, A5 + A7 = 5, then A9 + a11 =?

a5/a1=q^4
a7/a3=q^4
So (A5 + A7) / (a1 + a3) = 5 / 10 = q ^ 4 = 1 / 2
a9/a5=q^4
a11/a7=q^4
So (A9 + a11) / (a5a + 7) = q ^ 4 = 1 / 2
So A9 + a11 = 5 / 2

2.4 L = () l () ml 360 CC = () l 7.3 M2 = () m2 = () sdm2 = () sdm2

2.4 L = (2) l (400) ml
360 CC = (0.36) l
7.3 square meters = (7) square meters (30) square decimeters = (730) square decimeters

A fruit company has 20 cars. It plans to ship 90 tons of fruits from a, B and C to other places for sale. Each car can grow 5 tons of fruits, or 3 tons of fruits from B, or 4 tons of fruits from C. It is known that 700 yuan will be made for each ton of fruits from a, 1100 yuan for each ton of fruits from B, and 800 yuan for each ton of fruits from C, How to arrange the shipment to maximize the company's profit? What's the maximum profit?

Hello, Ryoma
Suppose there are x, y and Z cars carrying three kinds of fruits
x＋y＋z＝20…… ＜1＞
5x＋3y＋4z＝90…… ＜2＞
From < 1 > 2 > to
y＝x－10＞0…… ＜3＞
z＝30－2x＞0…… ＜4＞
From ＜ 3 ＞＜ 4 ＞
10＜x＜15
When x = 11, then y = 1, z = 8
x＝12,y＝2,z＝6
x＝13,y＝3,z＝4
x＝14,y＝4,z＝2
2．y＝5x×700＋（x－10）×1100＋（30－2x）×800＝3000x＋13000
When x = 14, the maximum profit of the company is y = 3000 × 14 + 13000 = 55000 yuan

How many tons is a cubic meter of granite

Because of the variety of stone, the density is not always between 2.5t and 2.8T

16-x^2/x^2-2x-3÷1^2-5x+4/x-3

16-x^2/x^2-2x-3÷1^2-5x+4/x-3
=(16-x²)/(x-3)(x+1)×(x-3)/(x-1)(x-4)
=-(x+4)/(x²-1)
I'm very glad to answer your questions. Skyhunter 002 will answer your questions
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After cutting a cylinder 8 decimeters high into an approximate cuboid with equal base, the surface area increases by 24 square meters. What is the volume of the cylinder?
Well, the answer must be within the scope of sixth grade knowledge

Let the radius of the bottom of the cylinder be r and the side length of the bottom square be a. according to the equal base condition, a & sup2 = π R & sup2, then a = R * root sign π. Since the base area does not change, the increase of the surface area is actually the difference between the product of the circumference and height of the circle and the square

60% of a number is equal to 6 / 7 of 28?

28*6/7/60%=24/60%=40