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post-16826

Oops…..solution a bit long

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Unsold first
Small : Big => 3 : 1 boxes

In term of moon cakes, x2 for small boxes, x4 for big boxes
6 : 4 = > 300
u = 30

there are 6u = 180 mooncakes in small boxes and 4u = 120 in big boxes

Number of unsold small boxes = 180/2 = 90 boxes
Number of unsold big boxes = 120/4 = 30 boxes.

Since she sold half of small boxes, so originally she had 90 X 2 = 180 small boxes.
And originally she had 180/4 = 45 big boxes.

Remove the 5 big boxed she repacked, so she had 25 big boxes left after selling some.

Number of big boxes she sold = 45 -25 = 20 boxes ###

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