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Verified answer
15 = { ( m + (2m) + (m + 2) + (m + 5) + ( 2m - 2)} / 515 × 5 = 7m + 5
75 = 7m + 5
75 - 5 = 7 m
70 = 7 m
m = 10
jadi usia termuda umur anak = 10 th