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Mathematics 18 Online
OpenStudy (anonymous):

Juanito estimated that 31% of 517 is 204. Is his estimate reasonable? no, because his calculation should be 30% of 520. No, because his calculation should be 40% of 520. Yes, because his calculation should be 30% of 510. Yes, because his calculation should be 40% of 510.

OpenStudy (anonymous):

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