The quality of grain stored in warehouse A and warehouse B is equal. After 8 tons of grain is taken from warehouse A and put into warehouse B, the quality ratio of grain stored in warehouse A and warehouse B is 4:5? (please use proportion solution)

The quality of grain stored in warehouse A and warehouse B is equal. After 8 tons of grain is taken from warehouse A and put into warehouse B, the quality ratio of grain stored in warehouse A and warehouse B is 4:5? (please use proportion solution)

(4) Suppose that the warehouse a originally had x tons of grain. (X-8): (x + 8) = 4:5 & nbsp; & nbsp; & nbsp; & nbsp; (x + 8) × 4 = (X-8) × 5 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 4x + 32 = 5x-40 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 72 A: the warehouse a originally had 72 tons of grain