2 proof readers are checking the same materials. One finds 70 mistakes and the other 80 mistakes. If only 25 of the mistakes were found by both readers, how many mistakes were found?
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X Reader= 70
Y Reader=80
Common number of mistakes= 25
Therefore, both number are reduced by 25. (70-25 & 80-25)
Ans= 25+45+55= 125 mistakes
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