self Maths Puzzle

"what rate percentage is 2 minute 28 seconds to an hour?"

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self Other Question

35,45,55,65,? Divide $288 (in whole $ increments) into a number of bags so that I can ask for any amount between $1 and $288, and you can give me the proper amount by giving me a certain number of these bags without opening them. What is the minimum number of bags you will require? How?