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19 July, 00:33

It took Marty 42 minutes to write a book report. then he spent 18 minutes correcting his report explain how you can use mental math to find out how long Marty spent on his book report

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  1. 19 July, 00:42
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    So as of now you have two numbers. You break down the problem and in this situation they are asking us to add both numbers ... in total Marty spent 42+18 = 60 mins in total on his book report.
  2. 19 July, 04:03
    0
    You simply add both times in your head to find the total of how long Marty spent on his book report.
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