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2014-06-06T12:57:35+07:00
Total = 38 orang
(38 x 6,0) - (30 x 5,8) = 228 - 174 = 54 ( total 8 orang)
rata2 = 54 : 8 = 6,75

maaf kalo ada kesalahan..
2 4 2
2014-06-06T13:25:24+07:00
5,8 x 30 = 174
misalkan rata2 8 siswa = n
174 + 8n  = 6
     38
174 + 8n = 6 x 38
174 + 8n = 228
8n = 228 - 174
8n = 54
n = 54 : 8
n = 6,75

jad, rata2 8 siswa adlh 6,75