1 math application problem, 1 math application problem, mathematics

If there are x people in the choir, then the number of people in the dance team is 1/3 x people.

x + 1/3 * x = 160

x solution yields x=120

Then the choir has 120 people, and the dance team has 1/3 * x = 1/3 * 120 = 40 people.

The number algorithm assumes that the number of shares of the choir is 1, then the number of shares of the dance team is 1/3, then the total number of shares is 1+1/3

Then 160 divided by (1 + 1/3) = 120 is the number of people in 1 part, that is, the number of choirs.

Then 120 x 1/3 = 40 is the number of people in the dance team.

120 chorus and 40 dancers.

Set up a choir x people.

1/3x+x=160

x=1201/3x=120*1/3=40

Hop + Dance = 160

Hop = 3 * dance.

So the number of dance teams is 160 4 = 40 people.

The choir is 120 people.

If the dance team is x people, the choir team will be 3x people.

x+3x=160

x=40

40 (person) 3x40 = 120 (person).

A: There are 40 members of the dance team and 120 members of the choir team.

If the number of dancers is x, the number of choirs is 3x

Because the choir and dance team have a total of 160 people.

So 1x+3x=160 people.

So 4x = 160 people.

The number of members of the dance team is 40.

160-40 = 120 people.

So the choir is 120 people.

15 * 4 * 3 = 180 cubic centimeters.

180 1 = 180 cm = 18 decimeters.

Therefore, the 15 cm long, 4 cm wide, and 3 cm high rectangle of wood blocks are sawn into a 1 cm long cube, and these small cubes are arranged in a row, 18 decimeters long.

1. 15000m-300*15, 15000n, 15000*15000* or the second is better.

3. The net income in the first year is 19500-9500=10000, and the growth rate is (13000-10000) 10000*100%=30%.

Method 1: The original ratio of A and B is 7:3 (35:15), and now the ratio of A and B is 5:4 (35:28). 104/(28-15)=8

8x35=280,8x15=120.

Method 2: 104 (7 3 5 4-1)=104 (13 15)=120, 120x7 3=280

Equation: 7x: (3x+104)=5:4 x=40 7x40=280, 3x40=120

Set B to be $ x and A to be $7 x $3.

7x/3）/(104+x)=5/4

28x=1560+15x

13x=1560

x=120, so B is 120 yuan, and A is 120*7 3=280 yuan.

Suppose that the original amount of money for A and B is $ x and $ y respectively.

Then: x y=7 3 x (y+104)=5 4 Simplify the above two formulas: y=3x 7 4x=5y+520 and bring the formula into equation 2.

4x-15x/7=520

Therefore: x=280 y=120

If A has 7x yuan, then B has 3x yuan.

7x/（3x+104）=5/4

Solution: x=40, A=7*40=280, B=3*40=120

This year, the sum of the ages of the mother and daughter is 53, and the sum of the ages of the mother and daughter 10 years ago is 33, and it is known that the age of the mother 10 years ago is 10 times the age of the daughter, if the age of the daughter 10 years ago is x, then the equation 10x+x=33 can be listed

First empty: 53-10-10=33 Second empty: The daughter was x 10 years ago. So the mother was 33-x ten years ago, and the answer: 33-x=10x

Ten years ago, both mother and daughter were 10 years younger, and the sum of their ages was 53 minus 20 equals 33

x+10x=33

y 1 180 * x *36 - x) 1 360 * x * x * 72 - 2x) 1 360 * x x 72-2x) 3], shirt belt.

When x 72-2x, i.e. big pants x 24 people, the highest amount of rolling coal is produced.

Solution: Set the payment time to be x months.

25000+1500x=

x = 50 substitute x = 50 = 25000 + (1500 50) = 100000 (yuan) Answer: The total price of Uncle Zhang's house is 100,000 yuan.

Let the payment time be x, then the equation is; 25000+1500x=3000*(x+1) 2+1500*(x+1) 2,x=33 and 1 3However, the month should be an integer and can only be larger than 33, so it is 34, so the payment time is 34 + 1 = 35 (month), but the payment can only be calculated according to the actual time: the total price of the house = the total price of the payment = 25000 + 1500 * 100 3 = 75000 (yuan), welcome to continue to ask.

Good luck with your studies.

Set the payment time to be y months.

25000+1500y=

y=5025000+1500 50=100000 yuan.

Set the payment time to be 2500 plus 1500xy = 1/2 yx3000 plus 1/2 yx1000 y=50 Total price 2500 plus 1500x50 = 100000