P6 / Maris Stella / 2019 / SA2 / Paper 2 – Q05 [2 marks]

Question:

Stan had 15 pieces of $2 and $5 notes. He exchanged some $2 notes for $5 notes and had an equal number of $2 and $5 notes in the end.
How many $5 notes did Stan have in the end?

Solution: