There is a cuboid timber with a volume of 500 cubic decimeters and a cross-sectional area of 20 square decimeters. What is the length of this timber?

There is a cuboid timber with a volume of 500 cubic decimeters and a cross-sectional area of 20 square decimeters. What is the length of this timber?

Length = 500 △ 20 = 25 cm
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A square table is composed of a table top and four legs. If one cubic meter of wood can be used to make 50 tables or 300 legs of a square table, it will take five cubic meters now
A square table is composed of a table top and four legs. If one cubic meter of wood can be used to make 50 square tables or 300 legs, and there are 50 cubic meters of wood, how many cubic meters of wood can be used for the table top and how many cubic meters of wood can be used for the table top? Can you find out how many square tables can be made

Use x cubic meters of wood as the table top and 50-x cubic meters of wood as the table legs
4×50x=300(50-x)
x=30
Use 30 cubic meters of wood to make the table top, 20 cubic meters of wood to make the table top, just matching? Can you work out the matching into 30 square tables

One variable equation: a round table has a table top and three legs, if 1 cubic meter of wood can
A round table consists of a table top and three legs. If one cubic meter of wood can make 50 tables or 300 legs, how many cubic meters can be used to make the table top and legs, and how many round tables can be made?
Write solution set, write equivalence relation, write answer! (unary linear equation!) write solution set, write equivalence relation, write answer! (unary linear equation!) write solution set, write equivalence relation, write answer! (unary linear equation!)

Set up x round tables
Then, each round table has three legs and one table top, so x is the number of tables, and 3x is the number of table legs. One cubic meter of wood can make 50 tables, or 300 legs, so a table top uses 1 / 50 cubic meter of wood, and a table leg uses 1 / 300 cubic meter of wood
(6 - cubic meter of table top) × number of legs per cubic meter = number of legs
Namely: 6 - X / 50 = 3 x * 1 / 300
X = 200 tables
4 cubic meters for table top
2 cubic meters for table legs