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6,36 = (124 + 5n) : 25
6,36 x 25 = 124 + 5n
159 = 124 + 5n
159-124 = 5n
35 = 5n -------->> n = 35/5 = 7.
20 + 5 = 25 x 6,36 = 159
159 - 124 = 35
35 : 5 = 7
Jadi nilai rata² 5 anak adalah 7