Meaning: the problem of difference times is to know the difference between two numbers and the multiple relationship between them, and find out the two numbers.
Formula: difference ÷ (multiple-1) = decimal; Decimal+difference or decimal × multiple = large number. 1, 2, 3 times the problem is called simple difference.
1.A has as much money as B. If A gives B 30 yuan, all the money of A is B 1/5 (score). Do you know how much money A and B have?
2. The decimal point of the number moves one place to the left, which is 2.25 less than the original number. What is the original number?
A pen is more expensive than a ballpoint pen, 6.6 yuan. It is known that the unit price of a ballpoint pen is 65438+ 0/4 (fraction) of a pen. What is the unit price of pens and ballpoint pens?
The number of parts produced in Li Shifu is six times that of apprentices. If two people each produce 20 more parts, the number of parts produced in Li Shifu is four times that of apprentices. How many parts were originally produced by the two?
5. A class bought several exercise books with the unit price of 0.5 yuan. If these exercise books are only given to girls, each person will get an average of 15. If these exercise books are only given to boys, everyone will get 10 on average. Then, divide these exercise books evenly in the class. How much does each person have to pay?
six
The number of roses in the garden is the number of peonies.
four
Double, if you add two kinds of flowers again.
50
Pots, then the number of pots of Chinese rose flowers is peony flowers.
2
Time magazine. Ask for Chinese rose flowers and peony flowers.
How many pots?
1.A has as much money as B. If A gives B 30 yuan, all the money of A is B 1/5 (score). Do you know how much money A and B have? A is now 60÷(5- 1)= 15 The original 15+30=45 yuan.
2. The decimal point of the number moves one place to the left, which is 2.25 less than the original number. What is the original number?
Now it is 2.25÷( 10- 1)=0.25. The original 0.25× 10=2.5.
A pen is more expensive than a ballpoint pen, 6.6 yuan. It is known that the unit price of a ballpoint pen is 65438+ 0/4 (fraction) of a pen. What is the unit price of pens and ballpoint pens? Ballpoint pen 6.6(4- 1)= 2.2 Pen 6.6+2.2=8.8
The number of parts produced in Li Shifu is six times that of apprentices. If two people each produce 20 more parts, the number of parts produced in Li Shifu is four times that of apprentices. How many parts were originally produced by the two?
Solve by equation
5. A class bought several exercise books with the unit price of 0.5 yuan. If these exercise books are only given to girls, each person will get an average of 15. If these exercise books are only given to boys, everyone will get 10 on average. Then, divide these exercise books evenly in the class. How much does each person have to pay?
According to the meaning of the question, the ratio of male to female is 15: 10=3:2, so girls account for 2/5.
four
15×2
5 ÷0.5=3 yuan
The number of pots of Chinese rose in the garden is four times that of peony. If 50 pots are added to each of the two kinds of flowers, the number of pots of Chinese rose flowers is twice that of peony flowers. How many pots of Chinese rose and peony are there?
Suppose the peony originally had X pots, then the rose originally had 4x pots (x+50) × 2 = 4x+50 2x+100 = 4x+50.
X=25
Rose: 25×4= 100