Math Riddles: Fill the Empty Boxes With The Missing Numbers

Let’s call the missing numbers as A, B, C & D.

Let’s write out the equations as follows;

1. A + B = 8;
2.  C – D = 6
3.  A + C = 13 &
4. B + D = 8

Since;

A + B = 8 = B + D

we can say;

A = D.

Substituting the value of A + D in (3) we get;

5. C + D = 13

Adding this with equation (2) we get.

C + D = 13
C – D = 6
2C = 19

Therefore;

C = 9.5

So substituting the value of C in (5) we get;

9.5 + D = 13

Therefore;

D = 3.5

Since A = D we have;

A = 3.5.

Putting value of A in (1) we get;

3.5 + B = 8

Therefore;

B = 4.5

So the missing numbers are as shown in the picture below;