Leah has 2 tanks. Tank S and Tank T are of different capacities. If Tank S is filled by a tap at a rate of 5 litres per minute and Tank T is filled by a tap at a rate of 6 litres per minute, when Tank S is completely filled, 7 litres of water flowed out from Tank T. If Tank S is filled by a tap at a rate of 4 litres per minute and Tank T is filled by a tap at a rate of 2 litres per minute, when Tank S is completely filled, Tank T is only half-filled. What is the capacity of Tank T? Express your answer in litres.
|
Scenario 1 |
Scenario 2 |
Tank type |
Tank S |
Tank T |
Tank S |
Tank T |
Volume of the tank |
5 u |
6 u - 7 |
4 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.
5 u = 4 p --- (1)
6 u - 7 = 4 p
6 u = 4 p + 7 --- (2)
Make u the same.
(1) x 6
30 u = 24 p --- (3)
(2) x 5
30 u = 20 p + 35 --- (4)
(3) = (4)
24 p = 20 p + 35
24 p - 20 p = 35
4 p = 35
1 p = 35 ÷ 4 = 8.75
Volume of Tank T
= 4 p
= 4 x 8.75
= 35 ℓ
Answer(s): 35 ℓ