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misalkan siswa kelas 9 a = Y anak
(15 x 80 ) + ( Y x 72 ) = 75 x ( 15 + Y)
1200 + 72 Y = 1125 + 75 Y
1200 - 1125 = 75 Y - 72 Y
75 = 3Y
Y = 25 siswa
30 8 orang (A)
misalkan :
anak perempuan = P
anak laki -laki = L
P+L = 36
L = 36 - P
(P x 70 ) + ( 61 x ( 36 - P ) = 36 x 63
70 P + 2196 - 61 P = 2268
70 P - 61 P = 2268 - 2196
9 P = 72
P = 8 orang