How to calculate this problem, the master help me

2 The master processes 1 9 pieces per minute, and the apprentice processes 1 15 pieces per minute.

Set the time to complete the task t

t/9+t/15=400

15t+9t=400x9x15

24t=3600x15

t=2250 minutes.

The master processes 1 9-1 15 = 2 45 more than the apprentice in one minute.

When completing the task, the master processes 2250 (2 45) = 100 more than the apprentice.

1. If 60% of the workers are shareholders, then at least 90%-(1-80%)=70% of the 10,000 households are shareholders.

60% are wage earners, then the other 40% are assumed to be 10,000 yuan households, then 60% of the wage earners have at least 80%-40%=40%=2 5 10,000 households.

20% of the households are not 10,000 yuan, the 20% are all shareholders, the minimum of 70% of the 10,000 households of this enterprise is not workers, the 40% are all 10,000 yuan households, the minimum of 40% of the 10,000 households of this enterprise is at least 40%, the time for the master to process 5, and the apprentice can only process 3.

Set up a total of 5x for the master to process 3x for the apprentice.

5x+3x=400 x=50 5x-3x=100 The master processes 100 more than the apprentice.

%-(1-90%)=70% (80% of 10,000 households, of which 10% are non-shareholders) 60%-(1-80%)=40% (60% of part-time jobs, of which 20% are non-10,000 households), that is, 2 5

2. Set up a master to process x, and an apprentice y, x+y=4009x=15y

x=250，y=150

Multi-processing x-y = 250-150 = 100 pcs.

The least case is that the workers are all stockholders, and the rest are found in 10,000 households.

The minimum number of wage earners is the same as above.

2. Their speed is 1 9 and 1 15

So how much time does it take to complete = 400 (1 9 + 1 15) then how much more time does the master have than the apprentice = (1 9-1 15) * 400 (1 9 + 1 15) = 100!

The price of each bottle of medicine in Changsheng Pharmacy is: 90 (8+1)=10 yuan.

The price of each bottle of medicine in Renai Yaodou store is: 66 6 = 11 yuan.

So it should be cheaper to hold it blindly is prosperous pharmacy empty god teasing.

Simplification? The result is 2 (1+x). The process line is as follows:

Shanzi begged the great god to tease this trick, how can it be considered fierce.

From the known conditions, it can be seen that there are 6 students seated around a table, and 4 more people will be seated at each additional table after that.

Then now there are 46 people, 40 more than 6 people at a table, 40 more 40 = 10 tables, so a total of 10 + 1 = 11 tables are needed.

11 tables sit around 6 students.

Two tables are combined to sit around 10 students.

Three tables are combined to seat 14 people.

It was found that from 6 onwards, for every additional table, 4 more students could have n tables (n is greater than 1).

Then the number of people who can sit is n+4 (n-1).

n+4(n-1)=46

n=11 so there are 11 sheets.

This is a quadratic equation and should not work out.

Multiply both sides by a+1 at the same time, that is.

a²-3a-3=0

Solving this quadratic equation gives the value of a.

First of all, we see that the middle is 40%, and 40% is. 6 divided. That is, 2 5.