For example, the plan of a rectangular playground has a scale of 1: 1 000. Measured from the map, it is 25cm long and1.8cm wide. What is the actual length and width of this playground?
Solution: Let the actual length be x meters and the actual width be y meters.
25cm = 0.25m, 18cm = 0. 18m。
0.25:x= 1: 1000
0. 18:y = 1: 1000
Then find the solutions of the two equations.