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Xiaohua bought 17 stamps with a face value of 20 cents and 10 cents with 2 yuan and 50 cents. How many stamps do you buy? Formula, don't use equations
2 yuan and 5 jiao = 25 Jiao
2 * 17 = 34 (angle)
34-25 = 9 (angle)
9 / (2-1) = 9 (sheets)
17-9 = 8 (sheets)
Xiaohua bought 17 stamps with a face value of 20 cents and 10 cents with 2 yuan and 50 yuan. How many stamps did you buy for each?
If there are x 1 jiao stamps, then (17-x) 20 Jiao stamps
x+2(17-x)=25
X = 9
Then 20 Jiao stamps have 17-9 = 8 (pieces)
A: Nine dime stamps are equal to 0.9 yuan, and eight dime stamps are equal to 1.6 yuan, which adds up to 2.5 yuan
Xiao Hua bought 17 stamps with a face value of 20 cents and 10 cents with 2 yuan and 50 cents. How many stamps do you buy for each?
2 jiao = 0.2 yuan, 1 jiao = 0.1 yuan,
If there are x stamps with a face value of $0.2, there will be (17-x) stamps with a face value of $0.1,
0.2x+0.1×（17-x）=2.5
0.2x+0.1×17-0.1x=2.5
0.1x=2.5-1.7
0.1x=0.8
x=8
The stamps with a face value of 0.1 yuan are: 17-8 = 9 (sheets)
A: there are 9 stamps with a face value of 0.1 yuan and 8 stamps with a face value of 0.2 yuan
Zhang Hongzheng bought 2 yuan stamps and 50 yuan stamps with 20 yuan. There are 16 stamps in total. How many stamps are there?
5 jiao = 0.5 yuan,
The five corner ones are:
（16×2-20）÷（2-0.5）
=12÷1.5
=8 (sheets);
2 yuan: 16-8 = 8 (sheets);
A: there are 8 for 2 yuan and 8 for 50 yuan
There are 37 $2 and $5 stamps, and $125 is spent. How many stamps are RMB 2 and $5 each?
According to the meaning of the title, if there are x $2 stamps, then there are (37-x) 5-dollar stamps
It costs 125 yuan
Then: 2x + 5 (37-x) = 125
The solution is: x = 20
So, there are 20 $2 stamps and 17 $5 stamps
20 yuan, 2 yuan per kilogram of apples and 3 yuan per kilogram of bananas. If you run out of money, what can you buy?
If you buy all the apples, you can buy 10 kg apples and 0 kg bananas
Buy a kilogram of apples and six kilograms of bananas
Buy 4 kg apples 4 kg bananas
Buy 7kg apples, 2kg bananas
Xiaoming bought apples. He spent half of the money he had brought with him when he bought 3 yuan apples per kilogram. The rest of the money he spent on apples was 2 yuan per kilogram
sorry,I don not know.
Xiao Ming paid 20.10 yuan for 3 kg pear and 3 kg apple, while Xiao Fang paid 15.10 yuan for 1 kg pear and 3 kg apple
If x yuan per kilogram of pear and Y yuan per kilogram of apple, there will be
3X+3Y=20.1
X+3Y=15.1
So x = 2.5 yuan / kg, y = 4.2 yuan / kg
Xiao Ming paid 20.1 yuan for 3 kg pear and 3 kg apple. Xiao Fang paid 15.1 yuan for 1 kg pear and 3 kg apple. How much yuan per kg apple and pear emergency
2 kg pear = 20.1-15.1 = 5 yuan
Pear is 2.5 yuan / kg
Xiao Ming paid 20.1 yuan for 3 kg pear and 3 kg apple, 15.1 yuan for 1 kg pear and 3 kg apple for Xiao Fang, how much yuan per kg pear and 1 kg apple?
Pear (20.1-15.1) / (3-1) = 5 △ 2 = 2.5 yuan / kg
Apple 20.1 △ 3-2.5 = 6.7-2.5 = 4.2 yuan / kg
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