sum from 5 to 15 is 95, check 95 sum from 5 to 15 is 95, check 95 sum from 0.5 to 1.5 is 9.5, check 9.5 sum from 0.5 to 1.5 is 9.5, check 9.5 sum from 5 to 15 is 95 95, check 95 95 sum from 5 to 15 is 95, check 95