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35years
Pupil-teacher ratio for primary education is 28 (2012).
It is usually calculated as the number of children (aged under 15 years) as a ratio of people of working age (ages 15 to 64). This ratio is currently in a state of flux because the pension age is being raised in many countries so that the denominator of the ratio covers a bigger age range.
If the ratio of similarity is 310, then the ratio of their area is 96100.
an eqivalent ratio is an ratio that is equal or you can simplfiy it