Using the numbers 09, 15 and 2010, what mathematical equation would give the sum of 23?

One possible equation that would give the sum of 23 using the numbers 09, 15, and 2010 is: 2010 - 15 + 09 = 2004 + 9 = 2013 - 90 = 23 In this equation, we first subtract 15 from 2010, giving us 1995. Then we add 9 to get 2004. Finally, we subtract 90 from 2013 to get 23, which is the desired sum.