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Marty took 42 minutes to write the report of a book. then it took me 18 minutes to correct your report. explains how you can use the mental spit to find the time dedicated marty to his book report

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t took Marty 60 minute to finish the report mentally you add 42 plus 8 is 50 plus 10 (because 18 minus 8 is 18) then that equals 60
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