He has 30 cards remaining. Divide this by the original number to determine the fraction remaining. Convert the fraction to a percentage by multiplying by 100%. This looks like ...
... 30/45 × 100% = 66 2/3% of the number he had originally
If 14 out of 20 is correct, then that is : 14/20 = 0.70 = 70%
Answer:
I think the answer is
6c + 240 = 1200
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