Ava has 2 containers. Container D and Container E are of different capacities. If Container D is filled by a tap at a rate of 4 litres per minute and Container E is filled by a tap at a rate of 6 litres per minute, when Container D is completely filled, 8 litres of water flowed out from Container E. If Container D is filled by a tap at a rate of 6 litres per minute and Container E is filled by a tap at a rate of 2 litres per minute, when Container D is completely filled, Container E is only half-filled. What is the capacity of Container E? Express your answer in litres.
|
Scenario 1 |
Scenario 2 |
Container type |
Container D |
Container E |
Container D |
Container E |
Volume of the container |
4 u |
6 u - 8 |
6 p |
2 p x 2 = 4 p |
Let 1 u be the time taken for Scenario 1.
Let 1 p be the time taken for Scenario 2.
4 u = 6 p --- (1)
6 u - 8 = 4 p
6 u = 4 p + 8 --- (2)
Make u the same.
(1) x 3
12 u = 18 p --- (3)
(2) x 2
12 u = 8 p + 16 --- (4)
(3) = (4)
18 p = 8 p + 16
18 p - 8 p = 16
10 p = 16
1 p = 16 ÷ 10 = 1.6
Volume of Container E
= 4 p
= 4 x 1.6
= 6.4 ℓ
Answer(s): 6.4 ℓ