A shop bought 200 bicycles at the price of 300 yuan each and sold them at the price of 400 yuan each. Two months later, the sales of bicycles exceeded the purchase price of these bicycles. How many bicycles have been sold at least?

Suppose x bicycles have been sold, and two months later, the sales amount of bicycles has exceeded the purchase price of these bicycles. According to the title, 400X ＞ 300 × 200, the solution is x ＞ 150. Therefore, at least 151 bicycles have been sold, and two months later, the sales amount of bicycles has exceeded the purchase price of these bicycles

The total cost of two pieces of clothing is 500 yuan,
It is decided that the price of clothing A should be set at 40% of the profit, and clothing B should be set at 50% of the profit. In actual sales, at the request of customers, two pieces of clothing should be sold at a 10% discount. In this way, the store will make a total profit of 157 yuan. What is the cost of two pieces of clothing A and B?
Solving linear equation with one variable

Suppose the cost of a is: X
The cost of B is: y
(1) X+Y=500
(2) (0.4X+X)*0.9-X+(0.5Y+Y)*0.9-Y=157
(3) Substituting (1) into (2) gives x = 200 and y = 300

The total cost of two pieces of clothing is 500 yuan. In order to make a profit, the store owner decides to price the clothing at 50% of the profit and the clothing at 40% of the profit. In actual sales, at the request of customers, the two pieces of clothing are sold at a 10% discount. In this way, the store makes a total profit of 157 yuan. How much is the cost of the two pieces of clothing?

Suppose the cost of a clothing is x yuan, then the cost of B clothing is (500-x) yuan. According to the meaning of the question: 90% · (1 + 50%) x + 90% · (1 + 40%) (500-x) - 500 = 157, the solution is: x = 300500-x = 200

Someone has a secret accounting method, when the income is 500 yuan, it is recorded as - 140, when the expenditure is 500 yuan, it is recorded as 860. If the account is recorded as 0, how much should it be recorded?
Someone has a secret way of accounting. When the income is 500 yuan, it is recorded as - 140. When the expenditure is 500 yuan, it is recorded as 860. If the account is 0, how much should it be recorded?

360
Because when the income is 500 yuan, it is recorded as - 140, when the expenditure is 500 yuan, it is recorded as 860. It should be stipulated that the income is recorded as negative, the expenditure is recorded as positive, and then 360 is added. Therefore, when the account is 0, it should be recorded as 0 first, and then 360 is added, it is recorded as 360

Fill in the brackets with the appropriate number
(1) Four fifths, two fifths, one fifth, (), one twentieth, (), ()
(2) 1 / 2, 3 / 4, 9 / 8, 27 / 16, (), (), ()

- 4 / 5 2 / 5 1 / 5 (1 / 10) 1 / 20 (1 / 40) (1 / 80)
II (81 / 32) (243 / 64) (729 / 128)

Fill in the brackets with the appropriate number

So the answer is: 510; 0.5; 910; 0.9

Fill in the appropriate numbers in brackets
（）.（）
( ）.6 /————————
4 （）
（）（） 2
——————————
（） 8 （）
（）（）（）
———————————
0

Is this a division
( 5 ）.6 /————————
4 （2）
（3）（9） 2
——————————
（2） 8 （0）
（2）（8）（0）
———————————
0

Fill in the brackets with the appropriate number
10 out of 12 = () 5 out of 12
3 and 1 / 3 = 1 / 3 ()
24 = ()
2 out of 5 ()

10 out of 12 = (5 out of 6)
3 and 1 / 3 = 10 / 3
24 = (6 / 25)
2 out of 5 is greater than 1 out of 3

Fill in the appropriate numbers in brackets:
Fill in the appropriate numbers in brackets:
96（16）2
88（）11
Why is this number

Fill in 2
Reason: 2 times 16 equals 32, and 32 times 3 equals 96
11 times 2 equals 22, 22 times 4 equals 88

Fill in the brackets with the appropriate numbers
5 ／ two thirds = (5 ×?) ／ (two thirds × three thirds) = 5 ×?
2 / 7 ／ 9 / 14 = (2 / 7 ×?) ／ (9 / 14 × 14 / 9) = 2 / 7 ×?
1 / 2 / 3 / 5 = 1 / 2 / 2 (1 / 2 ×?) 1 = 1 / 2 ×?

5 △ 2 / 3 = (5 × 3 / 2) / (2 / 3 × 3 / 2) = 5 × 3 / 2 = 15 / 2
2 / 7 ／ 9 / 14 = (2 / 7 × 14 / 9) ／ (9 / 14 × 14 / 9) = 2 / 7 × 14 / 9 = 4 / 9
Half / three fifths = half / half (half × six fifths) / 1 = half × five fifths = five sixths

A shop bought 200 bicycles at the price of 300 yuan each and sold them at the price of 400 yuan each. Two months later, the sales of bicycles exceeded the purchase price of these bicycles. How many bicycles have been sold at least?