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Mathematics, 02.10.2019 01:30 ghjjn

Before can broke his right arm, he was able to type 9 words per minute on his phone. after he broke his arm, he had to use his left hand for a while, and he could only type 6 words per minute . what is the difference between the number of words he could type in 5 minutes before and after he broke his arm?

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Before can broke his right arm, he was able to type 9 words per minute on his phone. after he broke...
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