1/10 of the journey is 18 miles. To solve this, find out how long the journey is. What is given is only 1/10 of the journey, so multiply it with 10 to get 1.
1/10 x 10 = 1
Since you multiplied one with 10, you must multiply the other (18 miles) with 10 too
18 x 10 = 180
The whole journey is 180 miles.
hope this helps
