Follow-Ups to Answer from Expert Soroban

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Sergio Monterroso wrote at 2007-10-09 01:18:00
The question tells you that Percy sold an average of 17 per day. You multiply 17 x 6= 102

Then you add what you know 19+21+6+17+11=74

Substract 74 from 102 and you have the answer 28

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krazykrys wrote at 2009-10-21 21:59:51
Take the number of pets given and add them together.



19 + 21 + 6 + 17 + 11 = 74



Multiply the average of 17 pets by the 6 days.



17 x 6 = 102



Then subtract the total number of pets you know, 74, from the total of pets you should have, 102, and you will have your answer.



102 - 74 = 28



You can check it by adding your answer to the number of pets that you knew and dividing it by the 6 days.



19 + 21 + 6 + 17 + 11 + 28 = 102



102 / 6 = 17



so it works!  

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