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Chandra took out half of the balls and put another 4 balls
At the end, there are 20 balls left in the box
20 – 4 = 16 (before Chandra put another 4 balls in)
16 x 2 = 32 (before Chandra took out half of the balls)

Meaning 32 balls are inside the box after Ali took out 1/5 of the balls and put another 8 balls:

32 – 8 = 24 (before Ali put another 8 balls in)
As Ali took out 1/5 of the balls, means there are 4/5 left.
4 units –> 24 balls
1 unit –> 6 balls
5 units –> 30 balls

Hope this answers the question.

Owlinker
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This is a fractional transfer question.

LCM (left)

4/5 × 1/2 = 4/10

   After Transfer  before            Transfer  Before 
  4u – 4  8u – 8  -8 10u – 20
    1/2 = 4/8  

4/5 = 8/10

4/5 = 16/20

 

4u = 20

1u = 5

10u = 10 × 5 = 50

50 – 20 = 30

 

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