Construct a ratio of the values from both types of notes by multiplying the value of a single note with the relative proportion of the number of notes. This gives you the ratio of the value of one $2 and three $5 notes. Let’s say this is 1 “set”. You need to find how many such “sets” there are. So you take the total amount and divide it by the value of 1 “set”. We find that there are 56 such “sets”. So the total value of $5 notes is given by the number of sets multiplied by the value of $5 notes in 1 set.