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A certain quantity is measured on two different scales,the R [#permalink]
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18 Feb 2013, 12:50
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A certain quantity is measured on two different scales, the R scale and the S scale, that are related linearly. Measurements on the R scale of 6 and 24 correspond to the measurements on the S scale of 30 and 60 respectively. What measurement on the R scale corresponds to a measurement of 100 on the S scale? (A) 20 (B) 36 (C) 48 (D) 60 (E) 84
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Re: A certain quantity is measured on two different scales,the R [#permalink]
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18 Feb 2013, 13:13
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Re: A certain quantity is measured on two different scales,the R [#permalink]
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18 Feb 2013, 17:50
Bunuel wrote: mun23 wrote: A certain quantity is measured on two different scales, the R scale and the S scale, that are related linearly. Measurements on the R scale of 6 and 24 correspond to the measurements on the S scale of 30 and 60 respectively. What measurement on the R scale corresponds to a measurement of 100 on the S scale?
(A) 20 (B) 36 (C) 48 (D) 60 (E) 84 As R increases by 18 (from 6 to 24), S increases by 30 (from 30 to 60). Thus increase of 18 in R corresponds to increase of 30 in S. Therefore change of 70 in S from 30 (when R is 6) to 100 must correspond to change of 70/30*18=42 in R. Hence, 100 in S corresponds to 6+42=48 in R. Answer: C. Sorry Bunuel, i didnt understand both question and concept of this! How u moved on with this?
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Re: A certain quantity is measured on two different scales,the R [#permalink]
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18 Feb 2013, 20:13
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Consider a line built on R scale.  6 24 The increase in value in R scale =246=18 points Now consider a line built on scale S. For the same increase in value, the increase in S scale is from 3060 i.e30 points(6030) So, we know that an increase of 18 points on R scale corresponds to 30 points on S scale. We need to find our what measurement on R scale corresponds to a value of 100 on S scale. an increase from 30 to 100 value on S scale= 70 points R scale S scale 18 point increase= 30 point increase ? = 70 point increase cross multiply ?=70*18/30=42 Thus, an increase of 70 points on S scale equals an increase of 42 points on R scale. So, the actual value=6+42=48 shanmugamgsn wrote: Bunuel wrote: mun23 wrote: A certain quantity is measured on two different scales, the R scale and the S scale, that are related linearly. Measurements on the R scale of 6 and 24 correspond to the measurements on the S scale of 30 and 60 respectively. What measurement on the R scale corresponds to a measurement of 100 on the S scale?
(A) 20 (B) 36 (C) 48 (D) 60 (E) 84 As R increases by 18 (from 6 to 24), S increases by 30 (from 30 to 60). Thus increase of 18 in R corresponds to increase of 30 in S. Therefore change of 70 in S from 30 (when R is 6) to 100 must correspond to change of 70/30*18=42 in R. Hence, 100 in S corresponds to 6+42=48 in R. Answer: C. Sorry Bunuel, i didnt understand both question and concept of this! How u moved on with this?



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Re: A certain quantity is measured on two different scales,the R [#permalink]
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19 Feb 2013, 10:17
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mun23 wrote: A certain quantity is measured on two different scales, the R scale and the S scale, that are related linearly. Measurements on the R scale of 6 and 24 correspond to the measurements on the S scale of 30 and 60 respectively. What measurement on the R scale corresponds to a measurement of 100 on the S scale?
(A) 20 (B) 36 (C) 48 (D) 60 (E) 84 Since there is a linear relationship between R and S....we can assume R =aS + b (or any other linear equation in terms of R and S) Now, when R= 6, S= 30....so the equation becomes 6 = 30a + b(i) When R = 24, S = 60...so the equation becomes 24 = 60a + b(ii) Solving the above two equations we get a = 3/5, b= 12...so the equation becomes R = (3/5)S  12....now put the value of S =100 in the equation...u'll get the value of R as 48...



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Re: A certain quantity is measured on two different scales,the R [#permalink]
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07 Mar 2013, 22:00
On scale R when we measure 6 and 24 we measure 30 and 60 respectively on scale S. Therefore an increase in 18 on scale R results in an increase of 30 on scale S.
90 on S (60 + 30) is equivalent to 42 (24 + 18) on R. To get 100 on S we add 10, an increase in 10 on S results in an increase of 6 on R (18*10/30).
42 + 6 = 48
Answer C



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Re: A certain quantity is measured on two different scales,the R [#permalink]
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06 Sep 2014, 23:41
mun23 wrote: A certain quantity is measured on two different scales, the R scale and the S scale, that are related linearly. Measurements on the R scale of 6 and 24 correspond to the measurements on the S scale of 30 and 60 respectively. What measurement on the R scale corresponds to a measurement of 100 on the S scale?
(A) 20 (B) 36 (C) 48 (D) 60 (E) 84 246 = 18 6030=30 18:30 > 6:10 so for every addition of 6 in R scale there will be 10 in S scale.



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A certain quantity is measured on two different scales,the R [#permalink]
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20 Mar 2017, 11:42
mun23 wrote: A certain quantity is measured on two different scales, the R scale and the S scale, that are related linearly. Measurements on the R scale of 6 and 24 correspond to the measurements on the S scale of 30 and 60 respectively. What measurement on the R scale corresponds to a measurement of 100 on the S scale?
(A) 20 (B) 36 (C) 48 (D) 60 (E) 84 6 > 24 > x 30 > 60 > 100 Through concept of gradient we can solve in less than 30 seconds. (246)/(6030)=(x24)/(10060) ==>x=48




A certain quantity is measured on two different scales,the R
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