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# What is the total cost to make 7 long distance telephone calls?

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Senior RC Moderator
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What is the total cost to make 7 long distance telephone calls?  [#permalink]

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04 Mar 2017, 12:39
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Difficulty:

25% (medium)

Question Stats:

72% (00:38) correct 28% (00:31) wrong based on 29 sessions

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What is the total cost to make 7 long distance telephone calls?

(1) The length of each call was at least 2 minutes.
(2) The rate for long distance calls is \$0.32 per minute

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Re: What is the total cost to make 7 long distance telephone calls?  [#permalink]

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04 Mar 2017, 22:20
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To answer this question we need to have the rates for all 7 calls and the duration of all 7 calls, or we need to tal time of all 7 calls and price /min (if rate for all calls is same)

(1) This gives us the min duration of each call as 2min, but it neither gives us total duration of all these calls nor the rate for each call.
SO, INSUFFICIENT

(2) This gives us the rate for all the calls but doesnt give us the duration of the calls
SO, INSUFFICIENT

(1) and (2) together, they give us the rate/min but we still do not know the total duration of the 7 calls.
SO, INSUFFICIENT

Hope it helps!
What is the total cost to make 7 long distance telephone calls?

(1) The length of each call was at least 2 minutes.
(2) The rate for long distance calls is \$0.32 per minute

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Re: What is the total cost to make 7 long distance telephone calls?  [#permalink]

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21 Mar 2019, 08:09
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What is the total cost to make 7 long distance telephone calls?

(1) The length of each call was at least 2 minutes.
(2) The rate for long distance calls is \$0.32 per minute

Target question: What is the total cost to make 7 long distance telephone calls?

When we SCAN the statements, we see the key phrase: at least
This allows us to jump straight to...

Statements 1 and 2 combined
There are infinitely many scenarios that satisfy BOTH statements. Here are two:
Case a: Each call was 2 minutes long, for a total of 14 minutes. At \$0.32 per minute, the answer to the target question is the total cost = \$0.32 x 14
Case b: Each call was 200 minutes long, for a total of 1400 minutes. At \$0.32 per minute, the answer to the target question is the total cost = \$0.32 x 1400
Since we cannot answer the target question with certainty, the combined statements are NOT SUFFICIENT

Cheers,
Brent
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Re: What is the total cost to make 7 long distance telephone calls?  [#permalink]

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25 Mar 2019, 08:43
What is the total cost to make 7 long distance telephone calls?

(1) The length of each call was at least 2 minutes.
(2) The rate for long distance calls is \$0.32 per minute

#1; cost per call not know; in sufficient
#2
duration of call not know ; insufficient
from 1 &2
we get diferent values at t >=2 in sufficient
IMO E
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Re: What is the total cost to make 7 long distance telephone calls?   [#permalink] 25 Mar 2019, 08:43
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