Thinking problems in the first volume of mathematics in grade three
Because "the surplus grain of warehouse A and warehouse B is just equal", the tonnage of warehouse A is 180-20= 160 tons.
Because "the storage capacity of warehouse A is five times that of warehouse B", warehouse A has five copies when warehouse B is regarded as 1 copy, so warehouse A is 5- 1=4 copies more than warehouse B, 4 copies are 160 tons, and 1 copy is160.