A highway is 45 km in length. 3/5 of the highway is paved.

What fraction of the highway is unpaved?

Answer:2/5

Step-by-step explanation:

3/5 of 45

3/5 x 45

(3x45) / 5

135/5=27

45-27=18

What of fraction of 45 equals 18

Let the fraction be y

y of 45=18

y x 45=18

Divide both sides by 45

(y x 45) / 45=18/45

y=2/5