1: The school sports team is going to buy a batch of volleyball with 360 yuan. The original price of each volleyball in the shopping mall is 30 yuan, but now it is 24 yuan for promotion How many volleyball can I buy? 2: Master Zhang produced 600 large screws, 2 boxes less than the small ones. It is known that each box contains 50 small screws and each box contains 60 large screws. Is the number of small screws produced by Master Zhang the same as that of large screws? Why?

1: The school sports team is going to buy a batch of volleyball with 360 yuan. The original price of each volleyball in the shopping mall is 30 yuan, but now it is 24 yuan for promotion How many volleyball can I buy? 2: Master Zhang produced 600 large screws, 2 boxes less than the small ones. It is known that each box contains 50 small screws and each box contains 60 large screws. Is the number of small screws produced by Master Zhang the same as that of large screws? Why?

360 / 24 = 15
2. Box number of large screws 600 / 60 = 10 boxes
Box number of small screws 10 + 2 = 12 boxes
The number of small screws is 12 * 50 = 600
Master Zhang produces as many small screws as big ones
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The school sports group bought 7 basketball and volleyball, which cost 252 yuan. How many basketball and volleyball? Volleyball 28 yuan, basketball 42 yuan
It's best to use equation to solve, the process should be absolutely complete!
It's OK to use arithmetic, but I still say that the best way to use equation is to use equation!
——————————————————————Come on,

Set volleyball bought x, basketball (7-x)
28x+42（7-x）=252
28x+294-42x=252
-14x=252-294
-14x=42
x=3
7-x=4
Answer: volleyball 3, basketball 4
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There are basketball, volleyball and football in the school sports room. The number of basketball accounts for 3 / 5 of the total number of the three kinds of balls. Football is 2 / 3 of volleyball. Football is 11 less than volleyball. How many balls are there in total?
Arithmetic solution

Football: 11 * 2 = 22
Volleyball: 11 * 3 = 33
Basketball: (22 + 33) / 5 * 3 = 88
Total: 88 + 33 + 22 = 135
Analysis: our breakthrough is "football is 2 / 3 of volleyball, football is 11 less than volleyball", even football is less than volleyball, that is 11, then, one is 11, so volleyball and football can be calculated

There are basketball, volleyball and football in the school sports room. The number of basketball accounts for 3 / 5 of the total number of three kinds of balls. Football is 2 / 3 of volleyball. Volleyball is 11 less than basketball. How many of these three kinds of balls are there?
11 (3 / 5-2 / 5 × 2 / 3 + 2) = 25. But the calculation seems to be wrong. Who can help me?

According to the question solution is decimal, according to the landlord's solution, "football is volleyball 2 / 3" into "volleyball is football 2 / 3", the result can be 25!

A store has two calculators with different purchase prices. They all sold for 64 yuan. One of them made a profit of 60% and the other lost 20%. In this transaction, the store ()
A. No loss, no gain B. earn 8 yuan C. lose 8 yuan D. earn 32 yuan

If the price of 60% profit is x yuan, then: x + 60% x = 64 & nbsp; & nbsp; & nbsp; 160% x = 64 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 40, and the price of 20% loss is y yuan, then: y-20% y = 64 & nbsp; 80% y = 64 & nbsp; & nbsp; & nbsp; & nbsp; y = 80, so the total price is: 40 + 80 = 120

A store has two calculators with different purchase prices, both of which sold for 64 yuan. One of them made a profit of 60% and the other lost 20%. In this transaction, the store sold a total of 64 yuan
How much is the profit (loss)?

Suppose one price is X Yuan and the other is y yuan
x（1+60%）=64,
y（1-20%）=64,
So: x = 40, y = 80,
Then 64 × 2 - (x + y) = 128-120 = 8
So the profit is 8 yuan

A store has two calculators with different prices, both of which sold for 80 yuan. One of them made a profit of 60% and the other lost 20%. In this transaction, the store ()
A. Don't lose don't earn B. earn 10 yuan C. lose 10 yuan D. earn 50 yuan

Let the price of profit be x yuan, 80-x = 60% XX = 50, and the price of loss be y yuan, y-80 = 20% YY = 10080 + 80-100-50 = 10 yuan

It is understood that individual clothing sales can be profitable as long as they are 20% higher than the purchase price, but the owners often set the price 50% - 100% higher than the purchase price. If you are going to buy clothing with a price of 150 yuan, what range should you counter-offer

Mathematical problems do not consider various cost factors, can only give you a reference:
Clothing price 150 yuan, according to the price 50% - 100%, clothing 20% profit, his purchase is 75 yuan - 100 yuan, if you can counter-offer, it should be 90 yuan - 120 yuan
The counter-offer of 150 yuan is as follows:
Mark price increases 50% is cost 100 yuan, gain 20% words 120 yuan can sell
Mark price increases 100% is cost 75 yuan, gain 20% words 90 yuan can sell
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If you ask for 90 yuan, if he says the lowest price is 120 yuan, you should know that he is 50% of the price
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Other information:----------------------------------------------------------------------------------
This is not absolute. Clothing stores have all kinds of expenses (water, electricity, wages, appearance fees, taxes, advertising fees). If the sales volume is low, then 20% is not cost-effective. If the sales volume is high, it is cost-effective
Some common styles: minimum sales * minimum selling price = keep expenses running

It is understood that individual clothing sales as long as 20% higher than the purchase price will be profitable, but the boss often price 50% - 100% higher than the purchase price, if you are ready to buy a price of 200
Yuan clothing, then
(1) What is the price range?
(2) Within what range should you counter offer? (round the result)

Suppose the purchase price is x yuan
150×（1+100%）

A store sells a product at 10% discount of the price, with a profit margin of 20%

Analysis
The original price is x yuan
The selling price is x × 90%
The purchase price is 30 yuan
The profit is x × 90% - 30%
The profit margin is 20%
Then profit = 30 × 20%
Suppose the price of each piece is x yuan,
According to the meaning of the title:
90％x－30＝30×20％
The solution is: x = 40
So the price of each piece is 40 yuan