For that indicator, UNESCO provides data for Peru from 1970 to 2018. The average value for Peru during that period was 28.64 students per teacher with a minumum of 17.39 students per teacher in 2018 and a maximum of 40.1 students per teacher in 1976.
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The student (pupil) to teacher ratio in Peru is the number of primary school pupils divided by the number of primary school teachers. It is generally considered better to have fewer pupils per teacher.
Definition: Primary school pupil-teacher ratio is the average number of pupils per teacher in primary school.