Xuan had some coffee. Each day, she drank an equal amount of coffee. At the end of the eighth day, she had 1300 mℓ of coffee left. At the end of the ninth day, she had 1200 mℓ of coffee left.
- What was the amount of coffee she drank each day?
- How much coffee did Xuan have at first? Give your answer in litres and millilitres.
(a)
Volume of coffee that Xuan drank each day
= 1300 - 1200
= 100 mℓ
(b)
Volume of coffee that Xuan had at first
= 1300 + 100 x 8
= 1300 + 800
= 2100 mℓ
1000 mℓ = 1 ℓ
2100 mℓ = 2 ℓ 100 mℓ
Volume of coffee that Xuan had at first = 2 ℓ 100 mℓ
Answer(s): (a) 100 mℓ; (b) 2 ℓ 100 mℓ