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Two measure standards R and S. 24 and 30 measured with R are [#permalink]
25 Jan 2005, 16:02

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Two measure standards R and S. 24 and 30 measured with R are 42 and 60 when they are measured with S, respectively. If 100 is acquired with S, what would its value be measured with R?

A short cut of solving this if you are given a set of choices to choose from

R 24 30
S 42 60
S-R 18 30
Notice 100 is about the same distance to 60 as 18.
You can conjuncture that R is about 30+(30-18)=42, which is very close to 130/3=43.3

There are 2 standards R and S.
If standard R is applied, 24 and 30 give 42 as result.
If standard S is applied, 24 and 30 give 60 as the result.
Now if for some values, we get 100 on application of S.. what would we get if we apply standard R on the same values?