5

I absolutely have no idea how to solve this question 24 in level 2.

This is the question:

134 = 2
222 = 4
101 = 8
333 = 1
712 = ??
1
  • The way think different writes their questions pains me.
    – Dragonrage
    Jan 28, 2016 at 4:18

2 Answers 2

10

If you add up all four number in each example equation, you get 10:

1+3+4+2=10
2+2+2+4=10
1+0+1+8=10
3+3+3+1=10

So for the last one it would be:

7+1+2+X=10

7+1+2 is already 10, so X is 0.

1
  • I found that having a link in these types of comments helps. Jan 28, 2016 at 7:47
0

Its 0. The right hand side is such a number that when added with the single digit sum(or mod 10 sum of the digits) of the left number is 1.

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