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7,25 . 15 = 12 . 7 +3x
24,75-84 = 3x
24,75 = 3x
x = 24,75/ 3
x = 8,25
nilai rata-rata 15 anak = 7,25
nilai rata-rata 3 anak = nilai 15 anak - nilai 12 anak di bagi 3
= (15×7,25) - (12×7) dibagi 3
= 108,75 - 84 : 3
= 24.75 : 3
=8,25