TELL WHO HAS BRAIN FAST
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the answers are in the above attachment.
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I don't have brain, but I can help you.
Let assume the boxes have a, b, c & d.
So
1. a + b = 8
2. a + c = 13
3. c - d = 6
4. b + d = 8
by adding all equation
2a + 2b + 2c = 35
taking 2 common
a + b + c = 35/2
by 1, putting value of a + b
8 + c = 35/2
c = 35/2 - 8
c = 19/2
by 2
a + c = 13
a = 13 - c
a = 13 - 19/2
a = 7/2
by 1
a + b = 8
b = 8 - a
b = 8 - 7/2
b = 9/2
by 4
b + d = 8
d = 8 - b
d = 8 - 9/2
d = 7/2
answer
7/2, 9/2, 19/2 & 7/2
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