Solve for S_m
S_{m}=130
Assign S_m
S_{m}≔130
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S_{m}=\frac{20\times 13}{2}
Add 3 and 10 to get 13.
S_{m}=\frac{260}{2}
Multiply 20 and 13 to get 260.
S_{m}=130
Divide 260 by 2 to get 130.
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