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(550+5x) : (10+5) = 53
(550+5x) : 15 = 53
550+5x = 53 x 15 = 795
5x = 795-550 = 245
x = 245/5 = 49
rata2 5 siswa tsb adalah 49
= 55x10 + 53x15/ 25
=550 + 795 /25
= 581.8