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

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Intern
Joined: 12 Jan 2019
Posts: 7
On monday Rhonda made an average of 12 phone calls per hour for the fi  [#permalink]

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Updated on: 01 Feb 2019, 22:33
00:00

Difficulty:

35% (medium)

Question Stats:

62% (01:19) correct 38% (01:51) wrong based on 14 sessions

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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

Originally posted by Nums99 on 01 Feb 2019, 06:20.
Last edited by chetan2u on 01 Feb 2019, 22:33, edited 1 time in total.
Intern
Joined: 17 Dec 2018
Posts: 21
Re: On monday Rhonda made an average of 12 phone calls per hour for the fi  [#permalink]

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01 Feb 2019, 06:58
1
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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01 Feb 2019, 08:28
1
Hi Nums99,

Welcome to gmatclub!

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

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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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01 Feb 2019, 08:42
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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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Joined: 12 Jan 2019
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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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01 Feb 2019, 20:01
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

Math Expert
Joined: 02 Aug 2009
Posts: 7334
On monday Rhonda made an average of 12 phone calls per hour for the fi  [#permalink]

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01 Feb 2019, 21:25
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

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.

B
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html
4) Base while finding % increase and % decrease : https://gmatclub.com/forum/percentage-increase-decrease-what-should-be-the-denominator-287528.html

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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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01 Feb 2019, 22:13
Hi chetan2u,

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Re: On monday Rhonda made an average of 12 phone calls per hour for the fi   [#permalink] 01 Feb 2019, 22:13
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