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-->6,2= x/15
x= 6,2x15
=93
-->6,5=93+y/15+5
6,5=93+y/20
6,5x20=93+y
130=93+y
y=37
y itu jumlah nilai kelima anak, jadi kalo rata2 nilainya ya tinggal 37/5=7,4