How fast can you fill the boxes?

Here is the answer of this viral puzzle

[3.5] + [4.5] = 8
+          +
[9.5] –  [3.5] = 6
||          ||
13          8

If you want to know how to solve similar puzzle, you can form them as mathematical equations as follows

A + B = 8

A + C = 13

B + D = 8

C – D = 6

Now add first and second and you will get

2A + B + C = 21

Similarly add third and fourth equations to get

B + C = 14

If now you will subtract these two equation you will get

2A + B + C – B – C = 21 – 14

2A = 7

A = 3.5

Now you have got value of A, which is 3.5 by replacing this value in your original equations you will get value of B, C and D

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