Mathematics
posted by Serena .
A map drawn to scale of 1:50 000 with the actual distance between two points is 4.5km.Calculate the number of centimetres that should be used to represent this distance on the map.

let's stick with ratios
4.5 km = 450000 cm
let x be the number of cm on the map
1/50000 = x/450000
x = 9 cm 
45km

The answer to this question is simple. Use ratios. It's more easier.
4.5 km = 450000 cm
let x be the number of cm on the map
1/50000 = x/450000
x = 9 cm