A math problem about money, about some math problems.

A wallet contains a number of 25 cents, 1 cents, 5 cents, and a number of 1 dollar coins, which add up to an average of 17 cents. If a $1 coin is taken out of the wallet, then the rest of the money adds up to an average of 18 cents.

The question is, how many 5 cents are in the wallet?

Question added: Yes 25 points, 1 point, 5 points are not yuan.

Solution: There is no solution to this problem.

Suppose A is the number of 25 cents.

b is the number of 1 cent coins.

c is the number of 5 cents.

25a+b+5c= 17*(a+b+c)

25a+(b-1)+5c+= 18(a+b-1+c)25a+b+5c )-1= 18(a+b+c) -1817*(a+b+c) -1= 18(a+b+c) -18a+b+c=17

25a+b+5c= 17*(a+b+c)

24a+4c=289-17=278

12a+2c=139,6a+c=, so there is no solution.

Suppose A is the number of 25 points.

b is the number of 1 points.

c is the number of 5 points.

d is the number of 100 points.

25a+b+5c+100d = 17*(a+b+c+d)25a+b+5c+(100-1)d = 18(a+b+c+d-1) is simplified to a+b+c+d = 18

The eigenvalues are then substituted for the calculation.

Let the number of 25 points be k

The number of 1 point is x, the number of 5 points is y, and the number of 1 yuan is z

x+5y+100z+25k=17*(k+x+y+z) x+5y+100(z-1)+25k=18*(k+x+y+z-1). z=-k-x-y-z+18

k+x+y+2z=18

k≥1,x≥1,y≥1,z≥1

Then 14 y 1

That is, the number of 5 points is indefinite between 1 and 14.

How is it possible to take away 1 yuan (note that this is more than the original average) and the average value rises from 17 to 18 points.

It's not good to use a little brain!!

Is it 25 points or 25 yuan, I didn't understand the question.

No solution!! Is there a 25 cent coin?

total = 15 (1 5 + 1 5-3 (3 + 5)) = 15 (1 40) = 600 boxes;

Good luck with your studies.

There are a total of x boxes.

1/5x+1/5x-15):[x-(1/5x+1/5x-15)]=3:5

5(2/5x-15)=3(3/5x+15)2x-75=9/5x+45

1/5x=120

x=600A: There are 600 boxes in total.

There is a piece of land in a city with a total of 100 acres, and a real estate developer purchased this land at a price of 800,000 yuan per mu, preparing to build a "Harmony Garden" residential area. It is planned to build eight subdivisions (Block A, Zone B, Zone C,... in this residential area, Area H), of which a 24-storey building will be built in Area A and Area B; One 18-storey building in C, D and E areas; A 16-storey building will be built in Block F, Block G and Zone H. In order to meet the different housing needs of the public, the developer is ready to build high-end residential buildings in both areas A and B, with 800 yuan per floor and a preliminary accounting cost of 800 yuan; The three communities in Area C and District D and Area E are all built into mid-range residences, with 800 yuan per floor and a preliminary accounting cost of 700 yuan; The three districts of F, G and H are built into affordable housing, with 750 yuan per floor and a preliminary accounting cost of 600 yuan.

The rest of the entire community is used for the construction of community road passages, afforestation, gardens, sports fields and residents' living shops, etc., which require a total of 99 million yuan plus property management fees, and the installation of floor elevators.

After the construction is completed, the developer intends to sell the high-end, mid-range and affordable housing at an average of 300 yuan, 2,600 yuan and 2,100 yuan respectively. If the house is all sold, can you help you figure out what the real estate developer's profit budget is?