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The charge for a telephone call between City R and City S is $0.42 for each of the first 3 minutes and $0.18 for each additional minute. A certain call between these two cities lasted for x minutes, where x is an integer. How many minutes long was the call?
(1) The charge for the first 3 minutes of the call was $0.36 less than the charge for the remainder of the call.
(2) The total charge for the call was $2.88.
(1) The charge for the first 3 minutes of the call was $0.36 less than the charge for the remainder of the call.
(2) The total charge for the call was $2.88.
24 Feb 2014, 06:53
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The charge for a telephone call between City R and City S is $0.42 for each of the first 3 minutes and $0.18 for each additional minute. A certain call between these two cities lasted for x minutes, where x is an integer. How many minutes long was the call?
Say the call was x minutes long.
(1) The charge for the first 3 minutes of the call was $0.36 less than the charge for the remainder of the call --> $0.42*3 + 0.36 = $0.18*(x-3) --> we can find x. Sufficient.
(2) The total charge for the call was $2.88 --> $0.42*3 + $0.18*(x-3) = $2.88 --> we can find x. Sufficient.
Answer: D.
Hope it's clear.
Say the call was x minutes long.
(1) The charge for the first 3 minutes of the call was $0.36 less than the charge for the remainder of the call --> $0.42*3 + 0.36 = $0.18*(x-3) --> we can find x. Sufficient.
(2) The total charge for the call was $2.88 --> $0.42*3 + $0.18*(x-3) = $2.88 --> we can find x. Sufficient.
Answer: D.
Hope it's clear.
General Discussion
18 May 2014, 10:21
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The Charge for a telephone call between City R and City S is $0.42 for each of the first 3 minutes and $0.18 for each additional minutes. A certain call between these two cities lasted for x minutes, where x is an integer. How many minutes long was the call?
(1) the charge for the first 3 minutes of the call was $0.36 less than the charge for the reminder of the call.
3*0.42=0.18*y-0.36 ( y is the number of minute for the remainder call) we can find the value of y and then y+3 ( the first minutes called) sufficient
(2) The total charge for the call was $2.88
3*0.42+0.18*z=2.88 we also can find z and z+3= the number of minutes the call last. sufficient
Hence D
(1) the charge for the first 3 minutes of the call was $0.36 less than the charge for the reminder of the call.
3*0.42=0.18*y-0.36 ( y is the number of minute for the remainder call) we can find the value of y and then y+3 ( the first minutes called) sufficient
(2) The total charge for the call was $2.88
3*0.42+0.18*z=2.88 we also can find z and z+3= the number of minutes the call last. sufficient
Hence D
