Feb 14th 2012, 4:37:14
***SPOILER ALERT***
Solution and explanation below.
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So I figured that each digit 0-9 must represent a number and that you add up those 4 numbers to get the answers. In that case, for any numbers that =0 all of the digits must represent 0 so off the bat I knew that 7, 1, 2, 3, and 5 represented 0 and I plugged all that in. Next I knew that whenever the same 4 digits equaled 4 that that digit must represent 1 (x+x+x+x=4 therefore x=1). So I knew that 6 represented 1. Once I plugged in the values for 1, 2, 3, 5, 6, and 7 I was able to fill in the blanks and figure it out. I wonder why they left out 4...
8709 = 4 = 2 + 0 + 1 + 1
7112 = 0 = 0 + 0 + 0 + 0
1172 = 0 = 0 + 0 + 0 + 0
6666 = 4 = 1 + 1 + 1 + 1
1711 = 0 = 0 + 0 + 0 + 0
3213 = 0 = 0 + 0 + 0 + 0
7662 = 2 = 0 + 2 + 2 + 0
9312 = 1 = 1 + 0 + 0 + 0
0000 = 4 = 1 + 1 + 1 + 1
2222 = 0 = 0 + 0 + 0 + 0
3333 = 0 = 0 + 0 + 0 + 0
5555 = 0 = 0 + 0 + 0 + 0
8193 = 3 = 2 + 0 + 1 + 0
8098 = 6 = 2 + 1 + 1 + 2
7777 = 0 = 0 + 0 + 0 + 0
9999 = 4 = 1 + 1 + 1 + 1
7756 = 1 = 0 + 0 + 0 + 1
6855 = 3 = 1 + 2 + 0 + 0
9881 = 5 = 1 + 2 + 2 + 0
5531 = 0 = 0 + 0 + 0 + 0
2581 = ? = 0 + 0 + 2 + 0 = 2
0=1
1=0
2=0
3=0
4=
5=0
6=1
7=0
8=2
9=1