A Book of fairy tales has a total of l98 pages. Xiaoqiang read 45 pages in five days. According to this calculation, how many days will it take Xiaoqiang to finish reading this book? (answer with proportional knowledge)

A Book of fairy tales has a total of l98 pages. Xiaoqiang read 45 pages in five days. According to this calculation, how many days will it take Xiaoqiang to finish reading this book? (answer with proportional knowledge)

Let's take X days to finish reading this book. The meaning of the title is as follows: (198-45): x = 45:5, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 45x = 153 × 5, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 45x = 765, & nbsp; & nbsp; & nbsp; & nbsp

In ancient Russia, there was a mathematical problem made up of Fairy Tales: a goose was flying in the air. When it met a group of geese on the way, it said: "Hi, 100 geese, where are you going?" the leading geese said, "you are wrong. We are not 100 geese. If we double first, then increase by 2%, then increase by 10%, and finally add you, we are 100 geese, How many geese did you say we had
To get the right answer

Analysis: reverse calculation
100-1 = 99
99 ÷ (1 + 1 / 10) = 90 (pieces)
90 ÷ (1 + 1 / 2) = 60
60 (1 + 1) = 30 (pieces)
There were 30 geese

80*200+50-60=?
What is the correct answer?

15990

The original price of a computer is 4500 yuan. After a 20% reduction, how much is it now

4500（1-3/20）=3825

The original price of a computer is 4500 yuan, but now the price is reduced by one third. How much is the price of each computer now

The way to find unit one: the front of the score, the back of the score, and the front of the score

There is a computer. After a 25% reduction, it is 6000 yuan. How much is the current price lower than the original price
But now there are two kinds of answers, one is 6000 / (1 + 25%) = 7500 yuan, the other is 6000 / (1-25%) = 8000 yuan. My idea is to reduce the price by 25% to 6000 yuan, then the original price should be 1 + 25%. Please ask experts to answer questions

2000 yuan

The current price of a computer is 6000 yuan, which is 25% lower than the original price. How much is the current price lower than the original price

Original price: 6000 / (1-25%) = 8000 yuan
The current price is 8000-6000 yuan lower than the original price

The price of a laptop used to be 6800 yuan, but now it is reduced by 1 / 17. How much is the price of this laptop?

The price is reduced by 1 / 17, that is, the price is reduced by 6800 * 1 / 17 = 400 yuan, so it is now sold for 6800-400 = 6400 yuan

The price of a computer is reduced by 10% compared with the original price of 7600 yuan for the first time and 10% for the second time. How much is the current price of the computer?

76nn × (1-1n%) = 76nn × multi n% = 6c4n (yuan); 6c4n × (1-1n%) = 6c4n × multi n% = 6156 (yuan); answer: the current price of computer is 6156 yuan

The original price of a computer is 7500 yuan. After the first price reduction of 10%, the second price reduction of 10%. How much is the current price of the computer?

7500×（1-10%）×（1-10%）=6075