Question:
A rectangular tank was filled with some water at first. Tap A was first turned on to add more water into the tank for 20 minutes. After 10 minutes, Tap B was then turned on to drain water out of the tank until the 20th minute. The line graph shows the volume of water in the tank over the period of 20 minutes.
How many litres of water did Tap B drain out?
Solution:
![P6 / Tao Nan / 2020 / SA2 Prelims / Paper 2 – Q07 [3 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/12/P6_Tao_Nan_2020_SA2_Paper2_Q07-Qns.jpg?resize=400%2C260&ssl=1)
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