It s a math problem again, it s a math problem

1.There are x female workers and y male workers. (x y) 12 20x Find the male-female ratio x:y 3:2. So the average number of male workers is 30.

2.Let the original deposits of A, B, and C be: x, y, z.

So x+y+z 2980, after the change (x 380) :(y 700) :(2 3 z) 5:

3:2。Solve the equation to obtain:

It turns out that the deposit of A, B, C is. So now the deposit is .

3.There are male players x and female players. Solve the equation to obtain: x 320, y 342. Therefore, excluding the number of teachers, the number of male and female students is 300, and the total number of students is 600.

The process of solving equations is omitted, and it is not necessarily the easiest way. Hope that helps.

1.There are a total of 60 fruits, 3 women and 2 men (in fact, there are more and the result is the same), so the average of men is 302. A takes out 380 yuan, B deposits 700 yuan, and the total money at this time is 3300, and C's money is later 3 2, and the ratio is 5:

So money 1500:900:900

After taking 1 3, it is 1500:900:6003. 15x/16=50y/57

x+y=662

x=320,y=342

15x 16=50y 57=300 so the number of students is 600.

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A b means equal to the smaller number in it.

x is always less than 3 x in x 3 x

So x 3 x=x

So f(x)=3 -x 3 x=3 (-x)=1 3 x range is》0 The second question is yes. What can be prescribed must be a non-negative number.

So (1 2) x-1>=0

x>=0

True Answer: 150 lights.

The reasons are as follows: 180 12 = 150, if not a circular playground, but a straight installation, requires 150 + 1 lights, since the first light at the beginning is also included.

If it is a circular playground, the first light from the beginning overlaps with the 150th light, so only 150 lights can be installed. Not 150-1=149 lights.

Solution: 1800 12-1=149

A, 149 lights are needed for one circle.

14 cm.

Is 2 3 two questions correct?

1 hour inlet pipe 5 pools per hour.

Outlet pipe 1 8 pools per hour.

Same open (1 5-1 8) = 3 40 pools per hour.

1: (3 40) = 40 3 hours.

2.Loss. Profit 20% cost: 9600 (1+20%) = 8000 yuan loss 20% cost: 9600 (1-20%) = 12000 yuan total cost:

8,000 + 12,000 = 20,000 yuan Total income: 9,600 * 2 = 19,200 yuan

(1) If the capacity of the pool is 1, the inlet rate is 1 5, and the outlet speed is 1 81 (1 5-1 8) = 40 3 hours.

No win, no loss.

(1) 40 3 hours.

2) Who gave the recommended answer to the loss of the piano store. The only wrong answer is considered a recommended answer.

1 1 (1 5-1 8)=40 32 Set the original price of the first unit x, and the second unit yx=8000

x=13000

The original price is 8000 + 13000 = 21000 is greater than **9600 times 2 loss.

1. Assuming that it can be filled in x hours, the flow rate when filling water is a, and the flow rate when discharging water is b, then the total full water is 5a, or 8b, because 5a=8b, then xa-xb=5a=8b, then x=40 3

2, where the original price of the profitable piano is 9600 divided by (1+20%) is equal to 8000, and the original price of the loss-making piano is 9600 divided by (1-20%) is equal to 12000, so the profitable piano earned 9600-8000=1600, and the loss-making piano lost 12000-9600=2400, so the loss was 2400-1600=800, so the loss.

1 is 2 3 choose b 1 3 less than 1 2 3 3 4 3 is greater than 3 4

2 4 25 = 16 100 105 500 = 21 100 15 125 = 12 100 21 35 = 60 100 2 = 2000 100 So 2 >> 21 35 >> 105 500 >> 4 25 >> 15 125