Pour 1.6 liters of water into two rectangular tanks to make their water level equal. What is the height in centimeters? One rectangle is 12 long and 10 wide, the other rectangle is 8 long and 5 wide,

1.6 L = 1600 CC
1600÷（12×10+8×5）
=1600÷（120+40）
=1600÷160
=10 cm

A 20 cm long, 15 cm wide and 12 cm deep rectangular water tank has a water depth of 6 cm. After a cube stone is put in, the water depth is 10 cm. What is the volume of the stone?

20 × 15 × (10-6) = 20 × 15 × 4 = 300 × 4 = 1200 (CC). A: the volume of this stone is 1200 CC

The two trains run in opposite directions. Car a runs 48 kilometers per hour, and car B runs 60 kilometers per hour. When the two trains are passing by, a passenger on car a runs in front of car B
He starts to count the time at the window, and it takes 38 seconds to pass by his window at the back of the car?
Please indicate how to analyze the proposal and solve the problem,

Suppose that car a is stationary,
Then, the speed of car B is: 60-48 = 12 km / h, that is: 10 / 3 M / S!
The front and rear of car B take 38 seconds to pass through the window,
Then, the total length of car B is: 10 / 3 × 38 = 380 / 3M

If natural numbers a and B satisfy the following conditions: a-1b = 1182, a: B = 7:13, then a + B=______ ．

a: B = 7:13, & nbsp; & nbsp; & nbsp; & nbsp; a = 7b13, & nbsp; & nbsp; & nbsp; 1A = 137b; if 1A = 137b, 1A − 1b = 1182, 137b − 1b = 1182, & nbsp; & nbsp; & nbsp; 67b = 1182, & nbsp; & nbsp; & nbsp; & nbsp; 7b = 182 × 6, & nbsp

A ^ 4-5a ^ 2-36 factorization

= (a²-9)(a²+4)
= (a+3) (a-3 ) (a²+4)

352 yuan to buy 100 kg of fruit orange and apple pear. It is known that orange costs 6 yuan per kg and apple pear costs 4 yuan on average. The money for orange and apple is 24 yuan more than that for pear
How many kilos did Apple buy

Let's buy apples x kg, pears y kg and oranges 100-x-y kg
(X+Y)×4+6×（100-X-Y）=352
（100-X-Y）×6+X×4-Y×4=24
The results of solving equations
X=47
Apple 47kg

One third of a number is less than one half of the number by two. What's the number

Unit conversion in Physics
4l = () ml = () CC = () M3
2.7g/cm3 = () kg / m3

4000 4000 0.004
two thousand and seven hundred

Pears and apples came in 180 kg from the fruit shop. Later, one-half of the pears were sold and two-fifth of the apples came in. Now, pears and apples are still 180 kg
How many kilos are there for apple and apple

The original pear [180 × (1 + 2 / 5) - 180] / (1 / 2 + 2 / 5) = 80 kg
So now the pear has 80 × (1-1 / 2) = 40 kg
Now Apple has 180-40 = 140 kg
Have a good time

What is the number in 2011

Rule: the numerator of the nth term is the nth power of (- 1), and the denominator is 2n, so the number of 2011 is - 1 / 4022

Pour 1.6 liters of water into two rectangular tanks to make their water level equal. What is the height in centimeters? One rectangle is 12 long and 10 wide, the other rectangle is 8 long and 5 wide,