Mom bought 7 meters of white cloth and 6 meters of printed cloth, which cost 52.3 yuan. It is known that white cloth is 3.7 yuan per meter and printed cloth is X yuan per meter.

1 and 3.7X7 mean: the unit price of white cloth is multiplied by the number of meters of white cloth, and the result is the amount of white cloth.

2.6X means: the number of meters of cloth multiplied by the unit price of cloth, and the result is the amount of cloth.

3.3.7X7+6X means: the amount of white cloth plus the amount of printed cloth results in the total amount of two kinds of cloth.

Supplement to the question:

One day, the grain store sold 300 kilograms of rice and 200 kilograms of flour, and * * * received 8 10 yuan per kilogram of rice and 0 1.5 yuan per kilogram of flour.

1 and 1.5X300 mean: the unit price of rice times the number of meters, and the result is the number of meters.

2.200X means: the amount of flour is multiplied by the unit price of flour, and the result is the amount of flour.

3. 1.5X300+200X represents the total amount of rice and flour.