Have a night owl. Solve the Olympiad questions.

1) A speed = 10 hours.

B speed = 10 hours.

2) Earn 25%, the cost is = 60 (1 + yuan.)

If there is a loss of 25%, the cost is =60 (

Income = 120, expenditure = (48 + 80) = 128 yuan, loss of 8 yuan.

3) Maximum cylinder height = 14, radius = 10, volume = cubic centimeters.

4) A completes x pieces per day, then the total parts are: 12x+12*12=12x+144.

Complete 20%, that is: 3x+2*12=(12x+144)*solution x=8.

Total number of parts = 12 * 8 + 144 = 240.

I didn't understand the first question, and it is recommended to finish the sentence. The second question lost 8 yuan, and the third question was 176.

Earn 25% at a cost of =60 (1+RMB.)

If there is a loss of 25%, the cost is =60 (

Income = 120, expenditure = (48 + 80) = 128 yuan, loss of 8 yuan.

1.Solution: Set the escalator to rise x steps per minute.

From the title: 5x+20*5=6x+15*6

Shift: -1x=90-100x=10

So the escalator goes up 10 steps per minute.

That is, there are a total of 5 * 10 + 20 * 5 = 150 (levels) Answer: There are a total of 150 escalators.

2.Solution: Suppose the sheep eat x every day, 10 cows and 60 sheep can eat for 8 days, because the cattle eat together (16*4*20x)=1280x

The sheep ate (80*12x)=960x.When the cow eats grass, the grass grows more than when the sheep eat (20-12) = y days.

Therefore, cattle eat more than sheep every day (1280x-960x) 8 = 40x original grass = grass eaten by sheep - number of days it takes sheep to eat grass from the grass that grows from the grass = 960x-40 * 12x = 480x grass can grow every day (960x-480x) 12 = 40x grass can be eaten by 10 cows and 60 sheep 480x + 40xy (10 * 4x + 60x) = 7y

y=8A: 10 cows and 60 sheep can eat for 8 days.

The greatest common divisor problem.

The side length is telling the whole number of friends, the square of the same area, there is no left".

It was decided that the side length must be a common divisor of 96,56.

At least "decided, is to take the maximum convention number of pins."

7 is coprime with 12, so the greatest common divisor of 56 and 96 is 8, which can be truncated into a square.

7*12=84 blocks.

At least the group is destroyed, then take the maximum number of collapses.

The maximum convention number is 2*2*2=8

96 8) * (56 8) = 12 * 7 = 84 blocks.

320t-280t=400 (boys can make one lap faster than girls).

40t=400

t=10

1 A square glass jar with an edge length of 20 cm is filled with water, and it is poured into another cylindrical glass bottle, which has a diameter of 40 cm and a height of 25 cm, how deep is the water in the bottle?

2 How many tons does a conical pile of sand weigh per cubic meter of sand with a base circumference of meters and a height of meters, and each cubic meter of sand weighs tons? (The number is kept as an integer).

3 A cylindrical pool with a bottom area of 314 square meters, which can hold 1,884 cubic meters of water, and the water surface of the pool is 2 meters from the mouth of the pool. How many cubic meters of water are already in the pool?

4 How many meters can a conical sand pile with a bottom circumference of meters and a height of 6 meters be used to pile a 10-centimeter-thick pavement on a 10-meter-wide road?

1.Divide by 2 = 135 divided by.

2.12x24 divided by 20=

3.(120-5+120)x120 except for Yu Liang Qi Xi to 2=14100

Answer; The average kilogram of cabbage per square meter is harvested.

2: The bottom of this yard hole is l centimeter.

The two triangles are equal in area.

s1＝s2.i.e. 12 (12 2) 2 20 l 2 solution :l

Answer; The bottom where this height sits is centimeters.

3: Solution, from the title: the upper bottom is 115 cm, the lower bottom is 120 cm.

s Trembling (115 120) 120 2 14100 cm A The original area of the playground was 14100 cm

The first question is multiplied and divided by 2 and then divided by 135

The second question 12 times 2 equals 2424 multiply by 12 by 2 and divide by 2 by 20

Question 3. 120 minus 5 equals 115, (120 plus 115) multiplied by 120 and divided by Marker Two.