Question:
Tap A and Tap B can fill a tank at a rate of 3 L per minute and 5 L per minute respectively. At first, only Tap A was turned on. When the tank was 1/4-filled with water, Tap B was then turned on. Six minute later, the tank was 7/8-filled with water. How much water was there in the tank just before Tap B was turned on?
Solution:
![P6 / CHIJ / 2020 / SA2 Prelims / Paper 1 – Q27 [2 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2021/08/P6_SA2_2020_CHIJ_Paper1_Q27-Qns.jpg?resize=400%2C260&ssl=1)
![P6 / ACS / 2020 / SA2 Prelims / Paper 1 – Q25 [2 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2021/05/P6_SA2_2020_ACS_Paper1_Q25-Qns.jpg?resize=400%2C260&ssl=1)