If 24 boxes = 40 percent
we can say that
12 boxes is 20%
since she finished 40% and now (100%-40% = 60%) we know she needs to unpack 60 %.
As i said:
24 box = 40%
12 box = 20 %
add em up and
36 box = 60%
She needed to unpack 60 boxes( 36+24 = 60)
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