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took out 1/5 ——–add 8 balls——– took out 1/2 ——–add 4 balls => 20 balls

Let’s count reversely.

                                                                                                         20-4 =16 balls

                                                                   16 + 16 = 32 balls

                                   32 – 8 =24 balls

24 ÷ (1-1/5) = 24 ÷ 4 x 5 = 30 balls

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