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x + y = 40
y = x + 14
x + y = 40
x + (x+14) = 40
2x + 14 = 40
2x = 40-14
2x = 26
x = 13
jd siswa pr = 13 dan siswa laki" = 27
L = 14 + P
40 = 14+P+P
40 = 14+2P
26 = 2P
P = 13 anak
L = 14+P
L = 14+13
L = 27 anak