Richard practiced each of 3 piano solos for 5/12 hour. how long did he practice in all?

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.

11/2.2 = 5 inches for the length 8.5/2.2= 3.86 inches for the width