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5 votes
To solve 35-19, jack used 35-20 what did he do next

User BDL
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2 Answers

7 votes
He added one to his answer! 35-19 is 16, 35-20 is 15
User Ivarec
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4 votes
then he got a sum of -1 (or negative one)
User XaolingBao
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