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rata2baru=(rataan 1 x jml siswa1 + rataan2 x jml siswa2 / jml siswa
68,2 = (68 x 20 + 69 x a) / (20 + a)
68,2 (20 + a) = 1360 + 69a
1364 + 68,2a = 1360 + 69a
1364 - 1360 = 69a - 68,2a
4 = 0,8 a
a = 4/0,8
a = 5 anak