Kim have 48 cards left in the box
The given parameters are:
Total = 120
Proportion given out = 6/10
The amount of cards left is calculated using:
Card left = (1 - Proportion given out) * Total
This gives
Card left = (1 - 6/10) * 120
Evaluate
Card left = 48
Hence, Kim have 48 cards left in the box
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