Nine digits are:-4,-3,-2,-1,0,1,2,3,4
Sum of Odd digits:(-3)+(-1)+1+3=0
Sum of Even digits:(-4)+(-2)+0+2+4=0
In the following sum the digits 0 to 9 have all been used, O = Odd, E = Even, zero is even and the top row's digits add to 9. Can you determine each digit?
In any day before noon how many times is the sum of the digits of the time equal to 15?
For instance 2:58 and 11:49 are two times when this is true.