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sapi = s
a+s = 50
2a + 4s = 170
------------------
2a + 2s =100
2a + 4s = 170
------------------- -
-2s = -70
s = 35
a + s = 50
a + 35 = 50
a = 15
Jadi, ayamnya ada 15 dan sapinya ada 35 :))