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2014-09-08T20:28:21+07:00
15 x 162 = 2430
Ditambah 5 anak : 20 x 166 = 3320

Dikurangi : 3320 - 2430 = 890
Dibagi => 890 : 5 = 178
4 4 4
2014-09-08T20:34:26+07:00
(15×162+5×A)/20 = 166
((15/20).162) + ((5/20).A) = 166
(3/4).162 + (1/4) A = 166
121.5 + (1/4) A =166
(1/4) A = 166 - 121.5
(1/4) A = 44.5
A = 44.5 × 4
A = 178
3 4 3