Three whole numbers are each rounded to the nearest 10. The sum of the rounded numbers is 70. Work out the maximum possible sum for the original three numbers.

Three whole numbers are each rounded to the nearest 10. The sum of the rounded numbers is 70.  Work out the maximum possible sum for the original three numbers.Sum of rounded numbers is 70, rounded numbers may be: 10,20,30,40,50. (60 or 70 are too big because we have to add at least two times 10, so it would give a sum bigger than 70) thus we have few possibilitiesie.10 10 5020 30 2040 20 10.......and more We want to know the maximum possible sum, thus we need the last digit to be 4 (ie. 14, 24, 34....) to round it down 14+14+54=8244+24+14=82the sum will be always the samethus, the answer is 82