3 / 4 of a number is equal to 1 / 4 of 180? 1. There are 30 sci-fi magazines in Xiaomin's home, which is two fifths of the story books. How many story books do you have? 2. There are 30 sci-fi magazines in Xiaomin's family, 3 / 5 less than story books. How many story books do you have? 3. There are 105 sci-fi magazines and storybooks in Xiaomin's family. The ratio of sci-fi magazines to storybooks is 2:5. What is the number of storybooks? 4. The speed of an ordinary motor car is about 200 km / h, which is one fifth of that of an ordinary Boeing airliner. Q: what is the speed of an ordinary Boeing airliner? 5. An ordinary train runs 90 kilometers in 3 / 4 hours. According to this calculation, it takes 9 / 2 hours to travel from place a to place B. how many kilometers are there between place a and place B? To be more specific, you need to calculate!

3 / 4 of a number is equal to 1 / 4 of 180? 1. There are 30 sci-fi magazines in Xiaomin's home, which is two fifths of the story books. How many story books do you have? 2. There are 30 sci-fi magazines in Xiaomin's family, 3 / 5 less than story books. How many story books do you have? 3. There are 105 sci-fi magazines and storybooks in Xiaomin's family. The ratio of sci-fi magazines to storybooks is 2:5. What is the number of storybooks? 4. The speed of an ordinary motor car is about 200 km / h, which is one fifth of that of an ordinary Boeing airliner. Q: what is the speed of an ordinary Boeing airliner? 5. An ordinary train runs 90 kilometers in 3 / 4 hours. According to this calculation, it takes 9 / 2 hours to travel from place a to place B. how many kilometers are there between place a and place B? To be more specific, you need to calculate!

180x1/4÷3/4=60 45x4/3=60
1、30÷2/5=75
2、30÷（1-3/5）=75
3. 105x5 / (5 + 2) = 755 / (5 + 2) is the proportion of storybooks in the total
4、200÷1/5=1000
5、90÷3/4x9/2=540
If you don't understand, please ask,
The calculation is not difficult
If you pay attention to their relationship, it's easy to make a formula
Easy to make mistakes is the second problem. The problem is very basic, usually should practice more
Sincerely useful, please adopt

How much divided by how much is equal to more than 11 4 Math master solution! Online and so on

There are many answers to this question
Generally speaking, the divisor and divisor in this topic should be positive integers by default
According to "divisor △ divisor = quotient The relationship of "remainder" can be seen: quotient × divisor + remainder = divisor!
The divisor is larger than the remainder, so the divisor may be: 1,2,3,4,5,6
When the divisor is 8, the divisor = 11 × 8 + 4 = 92;
When the divisor is 9, the divisor = 11 × 9 + 4 = 103;
When the divisor is 10, the divisor = 11 × 10 + 4 = 113; --- that is, 117 divided by 10 equals 11 plus 4;

7.8.9.10.11.12.13.14/15 the sum of nine numbers is 33

8, 15, 10
13, 11, 9
12, 7, 14

7 8 9 10 11 12 13 14 eight numbers are placed in a cross shape and a three grid rectangle. How to arrange them so that the sum of them is equal to 31
7 8 9 10 11 12 13 14 eight numbers are placed in a cross shape and a three grid rectangle. How to arrange them so that the sum of the three numbers in each direction is equal to 31
For example:
First row:?
Second row:??? rectangle:???
Third row:?

First row: 14
Second row: 12 9 10 rectangle: 7 11 13
Third row: 8