A rule for chained-fraction proportion problems
Reduce each set of fractions to a single fraction, then form two sums
A worked rule for solving proportion problems built from chains of fractions, using the example '1/2 of 1/3 of 1/4 of what number is 3/4 of 4/5 of 7/8?'. The reader is told to reduce the first set of fractions to a single fraction and the second likewise, then to form two sums as in an earlier example. The sheet is densely covered with further fraction calculations and prose that the bundle does not transcribe.
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Rule: reduce each chain of fractions, then take two sums
The example asks what number has '1/2 of 1/3 of 1/4' equal to '3/4 of 4/5 of 7/8'. The method is to collapse the first chain of fractions into one fraction and the second into one fraction, and then to combine them into two sums exactly as done in a previous worked case.