minta tolong nomer 35_37 &39

35)
EF = AD*EB + BC*AE
        ----------------------
              AE + EB
12 = 10*EB + 16*6
        ------------------
               6 + EB
12 (6 + EB) = 10EB + 96
72 + 12EB = 10EB + 96
12EB - 10EB = 96 - 72
2EB = 24
EB = 24 : 2
EB = 12

L = EF + BD  x  EB = 12 + 16  x 12 = 168 (C)
       ----------                 ---------
          2                          2

39)
total frekuensi = 33
median di urutan = (33 + 1) : 2 = 34 : 2 = 17
di urutan 17 = nilai 6 (A)