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Over the summer, Jackie played video games 3 hours per day. When school began in the fall, she was only allowed to play video games for half an hour per day. What is the percent decrese? Round to the nearest percent.

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I believe if I am correct it would be 60% because 30 min goes into 3 hours 6 times so let's say 6 hours is a hundred percent 30 min is like 10 percent so via it would be a 60 percent drop tell me if I am wrong please would like to know the right way for this problem
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