A tank is connected with both inlet pipes and outlet pipes. Individually, an inlet pipe can fill the tank in 7 hours and an outlet pipe can empty it in 5 hours. If all the pipes are kept open, it takes exactly 7 hours for a completely filled-in tank to empty. If the total number of pipes connected to the tank is 11, how many of these are inlet pipes?
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Answers
Answered by
5
Answer:
♠ The correct option is D.
Step-by-step explanation:
Let there be x inlet and y outlet pipes.
x + y = 11
Assume that the capacity of the tank is 35 units.
Inlet pipe fills 5 units and the outlet pipes empties 7 units in one hour.
The completely filled tank empties in 7 hours.
7y - 5x = 5
Solving two equations, y = 5 and x = 6
Answered by
3
Answer:
x + y = 11
7y - 5x = 5
y = 5
x = 6
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