Pertanyaan terlampir *—– Pagi :-:​

Nilai Oka

(77 × 19) / 19 = ((76 × 18) + x) / 19

77 × 19 = (76 × 18) + x

1.463 = 1.368 + x

x = 95

Nilai Erik

= x – 5

= 95 – 5

= 90

Nilai Rata – Rata Setelah Nilai Oka & Erik dimasukkan

= ( 1.368 + 95 + 90 ) / 20

= 1.553 / 20

= 77,65