Which tank will fill up first ?

Question

Answer 1

Tank 5 will fill up first'
The outlet of this tank is closed, hence no water will leave tank 5

Answer 2

5 Number will fill up first,

Answer 3

Tank number 5 will fill first

Answer 4

Answer:
tank number 5 will fill first as the water doesn't go from tank 5

Answer 5

Either tank 5 or tank 3.
.
If the pipe between tanks 5 and 2 is closed, tank 5 will fill up first.
If that pipe is open, tank 3 will fill up first.