I don't understand any of the four questions. . It seems so lame. .

1:

Solution: let the total length be x.

Analysis: From the starting point to the midpoint, it is half of the total length: 1/2X (that is, 6/ 12).

5/ 12 has been repaired, and there is still112 from the midpoint, and it is known that there is still12 km from the midpoint.

So:112x =12.

X = 144 km

2:

Solution: suppose there are x kilograms of rice (see clearly, it is the original, so it will be easier to do)

Sold 1/4, entered 360, and now the rice is 3/4X+360.

We also know that there are more rice now than before 1/6, so the rice now is: X+ 1/6X.

So: 3/4X+360 = X+ 1/6X.

X=？ (Solve the equation by yourself. Do it yourself and have plenty of food and clothing. It's easy to do more homework and calculate exams. )

This is the original, now it is more than the original 1/6, so the current meter is: X+ 1/6X (don't think that the calculation of x is over, carelessness will kill you soon).

3:

Solution:

First, calculate how many meters of cloth each garment needs:

60/ 15=4 (m)

Calculate how many meters of cloth each pair of trousers needs:

60/20 = 3 (meter)

Three coats are needed: 3 * 4 = 12 (meters).

Now it's left: 60- 12 = 48 (meters)

The remaining 48 meters are all made into pants, and each pair of pants needs 3 meters. How many pairs of trousers can you make? That's it, there's nothing to do. )

Either I misunderstood this topic or your teacher didn't write it clearly.

Solution: The current price is 4/5 of the original price, so it is cheaper than the original price 1/5.

Sao nian, study more and play less games. Don't think about sister paper all day. It is better to read useful books than novels.