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1235+Mira=1320
Mira=1320-1235
Mira=85
Jadi Nilai Mira 85
Nilai rata-rata= (19*65)+x / (19+1)
66 = 1235+x / 20
66*20 = 1235+x
1320 = 1235+x
x= 1320-1235
x= 85 <------- jawaban
"Mohon jadikan jawaban terbaik ya,,,"