P6 / Henry Park / 2021 / SA2 / Paper 1 – Q30 [2 marks]

Question:

At first, chairs in a hall were arranged in rows of 12. Then, 57 more chairs were brought in and all the chairs were rearranged into rows of 21. In the end, there were 5 fewer rows. How many rows of chairs were there in the hall in the end?

Solution: