Three whole numbers are rounded to the nearest 10. The sum of these new numbers is 80. What is the maximum sum of the original numbers

Question

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Answer 1

92.

A number can be rounded up if the ones digit is 5,6,7,8,or 9; and it can be rounded down if the ones digit is 4,3,2, or 1.

 

The maximum sum can be calculated if the number is rounded down and the largest value the ones digit can be is 4.

 

Therefore, 3·4=12; 12 more than 80. the sum of the original numbers is 92.