Atoms and protons are tricking. they snicks and twix
I think it is 6/16 because if you add 1/4 with 5/12
[ Answer ]

[ Explanation ]
- Formula For Area Of Trapezoid:

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A = 10
B = 18
H = 6
- Plug Numbers Into Equation:

10 + 18 = 28
28 ÷ 2 = 14
14 · 6 = 84
84
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The missing fraction would be

since it is exactly in the halfway between