Question:
Mr Choo needs a total of 15 h to prepare 1800 rice dumplings. He prepares the same number of rice dumplings every hour. When his wife helps him for 4 h, 1800 rice dumplings can be prepared in 9 h.
(a) What is the average number of rice dumplings that Mr Choo’s wife prepares in the 4 hours?
(b) What is the difference in the time taken between Mr Choo and his wife if she prepares 1800 rice dumplings alone?
Solution:
![P6 / Nan Hua / 2021 / SA2 /
Paper 1 – Q25 [2 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2022/08/P6_SA2_2021_Nan_Hua_Paper1_Q25-Qns.jpg?resize=400%2C201&ssl=1)
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