Today , Harbeck told us to tell us the definitions of the keywords, heres the keywords.

twoterm ratio
threeterm ratio
,parttopart ratio
parttowhole ratio
unit rate
unit price
and proportion,
Two Term Ratio
 compares 2 quantits measured in the same units.
eg. 5:4 or 4 to 8
Three Term Ratio
Compares three quantites measured in the same units
eg. a:b:c or a to b to c
Part to Part Ratio
compares different parts of a group together
Part to Part whole Ratio
Compares one part of a group to the whole group
eg.a:b or 5/6
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