Three whole numbers are each rounded to the nearest 10 the sum of the rounded number is 70 what is the maximum possible sum for the original three numbers

Answer 1

3 numbers that have been rounded to 10 and add up to 70 could be 30 + 20 + 20.

The largest numbers that round to these numbers would be 34 + 24 + 24 = 82.

Looking at it another way, each number rounded to 10 could only have 4 or less as its units digit.

So if I take the 4 from each of the 3 numbers and add them I get 12.

Then I add the 12 to 70 and get 82.