Explanation:
he started with 12 balls.
at the end (!) he had 4 left.
this does NOT mean he lost 4 balls, it means that he lost some balls (x) had at the end 4 balls remaining.
so, it is
12 - x = 4
12 = 4 + x
x = 12 - 4 = 8
he lost 8 balls.
Answer:
12-4=8
start with 12 balls if you lose 4 then its 12-4 which is 8
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