You are given Richard’s piano practice for 3 piano solos. Every piano sol he makes takes 5/12 hour. You are asked to find how long Richard is going to practice his piano solo. So we have for every 1 piano solo he makes this is equal to 5/12 hours. This can be best represented by ratio and proportion.
1 piano solo/(5/12 hour) = 3 piano solo/(number of hours)
Number of hours = 3 piano solo/ (1 piano solo/5/12 hours)
Number of hours = 5/4 hours or 1.25 hours.