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Water is pumped into a partially filled tank at a constant

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Water is pumped into a partially filled tank at a constant [#permalink]

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Water is pumped into a partially filled tank at a constant rate through an inlet pipe. At the same time, water is pumped out of the tank at a constant rate through an outlet pipe. At what rate, in gallons per minute, is the amount of water in the tank increasing?

(1) The amount of water initially in the tank is 200 gallons.
(2) Water is pumped into the tank at a rate of 10 gallons per minute and out of the tank at a rate of 10 gallons every \(2\frac{1}{2}\) minutes.

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Re: Water is pumped into a partially filled tank at a constant [#permalink]

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SOLUTION

Water is pumped into a partially filled tank at a constant rate through an inlet pipe. At the same time, water is pumped out of the tank at a constant rate through an outlet pipe. At what rate, in gallons per minute, is the amount of water in the tank increasing?

(1) The amount of water initially in the tank is 200 gallons. Clearly insufficient.
(2) Water is pumped into the tank at a rate of 10 gallons per minute and out of the tank at a rate of 10 gallons every \(2\frac{1}{2}\) minutes. Since water is pumped out of the tank at a rate of 10 gallons every \(2\frac{1}{2}=\frac{5}{2}\) minutes, then it's pumped out at a rate of \(\frac{10}{(\frac{5}{2})}=4\) gallons per minute, hence the net increase is \(10-4=6\) gallons per minute. Sufficient.

Answer: B.
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

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Re: Water is pumped into a partially filled tank at a constant [#permalink]

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New post 06 Aug 2012, 23:28
Answer to this is B?

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Re: Water is pumped into a partially filled tank at a constant [#permalink]

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Water is pumped into a partially filled tank at a constant rate through an inlet pipe. At the same time, water is pumped out of the tank at a constant rate through an outlet pipe. At what rate, in gallons per minute, is the amount of water in the tank increasing?

(1) The amount of water initially in the tank is 200 gallons. Clearly insufficient.
(2) Water is pumped into the tank at a rate of 10 gallons per minute and out of the tank at a rate of 10 gallons every \(2\frac{1}{2}\) minutes. Since water is pumped out of the tank at a rate of 10 gallons every \(2\frac{1}{2}=\frac{5}{2}\) minutes, then it's pumped out at a rate of \(\frac{10}{(\frac{5}{2})}=4\) gallons per minute, hence the net increase is \(10-4=6\) gallons per minute. Sufficient.

Answer: B.
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: Water is pumped into a partially filled tank at a constant [#permalink]

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Re: Water is pumped into a partially filled tank at a constant [#permalink]

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New post 06 Feb 2015, 16:04
Hello from the GMAT Club BumpBot!

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Re: Water is pumped into a partially filled tank at a constant [#permalink]

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New post 27 Apr 2016, 05:39
Statement 1 gives the initial capacity of the tank, clearly insufficient
statement 2 gives both the rate of inflow as well as outflow which is sufficient to calculate the rate at which water is increasing per minute in the tank
Answer - B
Re: Water is pumped into a partially filled tank at a constant   [#permalink] 27 Apr 2016, 05:39
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