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On monday Rhonda made an average of 12 phone calls per hour for the fi

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On monday Rhonda made an average of 12 phone calls per hour for the fi  [#permalink]

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New post Updated on: 01 Feb 2019, 23:33
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On monday Rhonda made an average of 12 phone calls per hour for the first 6 calls she made , and then an average of 6 phone calls per hour for the remaining 6 calls she made. What was the average number of phone calls per hour that Rhonda made for the entire day

(a) 7.5
(b) 8.0
(c) 9.5
(d) 10.0
(e) 10.5

please help

Originally posted by Nums99 on 01 Feb 2019, 07:20.
Last edited by chetan2u on 01 Feb 2019, 23:33, edited 1 time in total.
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Re: On monday Rhonda made an average of 12 phone calls per hour for the fi  [#permalink]

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New post 01 Feb 2019, 07:58
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12 phone calls per hour for first 6 calls = 30 minutes total for the first 6 calls
6 phone calls per hour for last 6 calls = 1 hour total for the last 6 calls

12 total phone calls over 1.5 hour = 12/1.5 = 8

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Re: On monday Rhonda made an average of 12 phone calls per hour for the fi  [#permalink]

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New post 01 Feb 2019, 09:28
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Hi Nums99,

Welcome to gmatclub!

These kind of questions should be posted in PS or DS subforumes here:
Data Sufficiency forum
Problem solving forum

Please also read:
Rules for Posting - Please Read this Before Posting
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Re: On monday Rhonda made an average of 12 phone calls per hour for the fi  [#permalink]

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New post 01 Feb 2019, 09:42
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Welcome to GMAT Club Nums99 - please post quant PS questions in the PS forum. I am moving it to PS now.
Thank you.
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Re: On monday Rhonda made an average of 12 phone calls per hour for the fi  [#permalink]

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New post 01 Feb 2019, 21:01
On monday Rhonda made an average of 12 phone calls per hour for the first 6 calls she made , and then an average of 6 phone calls per hour for the remaining 6 calls she made. What was the average number of phone calls per hour that Rhonda made for the entire day

(a) 7.5
(b) 8.0
(c) 9.5
(d) 10.0
(e) 10.5

please help!!!!
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On monday Rhonda made an average of 12 phone calls per hour for the fi  [#permalink]

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New post 01 Feb 2019, 22:25
Nums99 wrote:
On monday Rhonda made an average of 12 phone calls per hour for the first 6 calls she made , and then an average of 6 phone calls per hour for the remaining 6 calls she made. What was the average number of phone calls per hour that Rhonda made for the entire day

(a) 7.5
(b) 8.0
(c) 9.5
(d) 10.0
(e) 10.5

please help!!!!


So, there are two sets of 6 calls made at two different frequencies.
let us calculate the time for these..

(i) 6 calls at the rate of 12 calls per hour..
If 12 calls in one hour, 6 calls will be made in \(6*\frac{1}{12}=\frac{1}{2}\)hr

(ii) 6 calls at the rate of 6 calls per hour..
so 1 hour for these calls.

Thus, total calls = 6+6 or 12 calls, and time taken = \(1+\frac{1}{2}=\frac{3}{2}\)hr
Average calls per hour = \(\frac{calls}{time}=12/\frac{3}{2}=\frac{12*2}{3}=8\)calls per hour.

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Re: On monday Rhonda made an average of 12 phone calls per hour for the fi  [#permalink]

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New post 01 Feb 2019, 23:13
Hi chetan2u,

Could you please add OA to above question.
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Re: On monday Rhonda made an average of 12 phone calls per hour for the fi  [#permalink]

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New post 22 Feb 2019, 09:57
Nums99 wrote:
On monday Rhonda made an average of 12 phone calls per hour for the first 6 calls she made , and then an average of 6 phone calls per hour for the remaining 6 calls she made. What was the average number of phone calls per hour that Rhonda made for the entire day

(a) 7.5
(b) 8.0
(c) 9.5
(d) 10.0
(e) 10.5

please help


This question can be solved by dividing the total number of calls by total time, i.e. 12/1.5 = 8 calls per hour
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Re: On monday Rhonda made an average of 12 phone calls per hour for the fi  [#permalink]

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New post 24 Feb 2019, 06:48
Nums99 wrote:
On monday Rhonda made an average of 12 phone calls per hour for the first 6 calls she made , and then an average of 6 phone calls per hour for the remaining 6 calls she made. What was the average number of phone calls per hour that Rhonda made for the entire day

(a) 7.5
(b) 8.0
(c) 9.5
(d) 10.0
(e) 10.5



Since she made the first 6 calls in 6/12 = 1/2 hour and the next 6 calls in 6/6 = 1 hour, her average number of phone calls per hour is:

(6 + 6)/(1/2 + 1) = 12/(3/2) = 12 x 2/3 = 8

Answer: B
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Re: On monday Rhonda made an average of 12 phone calls per hour for the fi   [#permalink] 24 Feb 2019, 06:48
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