1 6 year old math problem 10, 1 6 year old math problem

Solution: (1) Set this road to be x meters.

x/30-x/50=100

x=7500

The road is 7,500 meters long.

It takes 50 days for A and 30 days for B, and the title is known.

2) Payable A: 2000*50=100000 yuan.

Payable B: 5,000 * 30 = 150,000 yuan.

Therefore, the first engineering team should be tendered.

Set a day of y for A and 42-day for B.

y/50+（42-y）/30=1

y=30, then A does it for 30 days, and B does it for another 42-30=12 days.

Required: 2000 * 30 + 5000 * 12 = 120,000 yuan.

Therefore, it is reasonable. If you are a junior first, apply the inequality solution. That's all you can do in the sixth grade.

1) A needs 50 days to do alone, B needs 30 days to do alone, assuming that A constructs x meters per day, then B alone can construct x + 100 meters per day, then there is 50x = 30 (x + 100), solve the equation, x = 150, the road length = 50 * 150 = 7500m

2) A needs a salary to complete the project: 2000 * 50 = 100,000 yuan, team B needs a salary: 5,000 * 30 = 150,000 yuan, regardless of time, should be tendered for team A.

Due to the constraints of time and money, it is unreasonable to let one of the teams of A and B do it alone.

Hehe, I hate math problems the most.

What is the scale of a map that uses a 2 cm line to represent the actual distance of 300 kilometers?

Scale Distance on Graph: Actual distance.

2 cm: 300 km.

2 cm: 30000000 cm.

The distance from Beijing to Guangzhou is 14 centimeters from the map, and what is the actual distance from Beijing to Guangzhou.

14 1 1500000 210000000 2100 (km).

The scale of this diagram is: 2 cm: 300 km = 1 cm: 150 km

The actual distance from Beijing to Guangzhou is: 14*150=2100km

October's production is 90% of November's, i.e. November's multiplied by 90% equals October's. The reverse is that dividing by 90% for October equals November. (3600 90% = 4000 units).

In October, it was 1, and that was 25% more than in October was 1 plus 25%, and in December it was 12 times 1 plus 25%. 3600 (1+25%)=4500 units.

It is important to know how to do it, otherwise you will not do it in the future!!

Solution: The number of units produced in November is 3600 90%=4000

The number of units produced in December was 3600 (1+25%)=4500

A: The number of production units in November and December was 4,000 units and 4,500 units respectively.

November: November - 1 (unit 1) October - 90% 3600 90% 4000 (units).

December: October - 1 (unit 1) December - 125 (1 25%)

3600 times 125 4500 (sets).

A: 4000 units were produced in November and 4500 units were produced in December.

November: 3600 = 4000 (sets) December: 3600x(1+25%)=4500 (sets) A:

4,000 units were produced in November and 4,500 units in December. Hope to support me!

If A and B become.

Inverse proportion. B is also inversely proportional to C, so A must be inversely proportional to C, is this true? Please explain

This is not right.

Let a=k1 b, i.e., ab=k1

b = k2 c, that is: bc = k2 (chain trillion k1, k2 is the fixed value) a c = (ab) (bc) shed rock rent = k1 k2 (also fixed jujube eggplant value) i.e.: a = (k1 k2) c

So, A is directly proportional to C.

If a is inversely proportional to b, and the set amount is k, then: k=ab

b = k ab and c are also inversely proportional to the Qiao sen example, the set quantity is m, then: m=bc=k*c a

MK is all quantitative. Therefore, A and C are in the ratio of filial piety to each mu.

The circumference of a rectangular piece of paper is 80 cm, and the sum of length and width is 80 2 = 40 cm and width is 40 (1 + 5 3) = 15 cm.

Cut the largest round piece of paper from a rectangle, the diameter of this circle is equal to the radius of the rectangle with a wide circle is 15*2=

So the area of a round piece of paper is a square centimeter.

Let the length be x and the width be y

Then 2(x+y)=80

again x=5y 3

Get x=25

y=15 When the diameter of the cut garden is its width, the area of the circle is the largest, so the diameter d=so the square of the area=

Calculate the length of the width of the rectangle: 80 2=40

40 (1+5 3)=15, then the radius of this circular piece is: 15 2=

Set the width to x

Equation 2 [x+5 3x] = 80

16/3x=80

x=1515 is the diameter of the circle, so the radius is.

x ( x please choose me, I'm in my second year of junior high school.)

First, calculate the length and width: width 80 (1+3 5)=50 length 50*3 5=30

So the diameter of the largest circle is 30

Area: square centimeters.

80/2=40

40 (5/3 + 1) = 15 Length: 15 * 5/3 = 25 Width: 15 * 1 = 15

The radius of the circle 15 2= the square of the area of the circle*