Solve for m
m=\frac{s}{400}
Solve for s
s=400m
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s=\frac{440+360}{2}m
Add 200 and 240 to get 440.
s=\frac{800}{2}m
Add 440 and 360 to get 800.
s=400m
Divide 800 by 2 to get 400.
400m=s
Swap sides so that all variable terms are on the left hand side.
\frac{400m}{400}=\frac{s}{400}
Divide both sides by 400.
m=\frac{s}{400}
Dividing by 400 undoes the multiplication by 400.
s=\frac{440+360}{2}m
Add 200 and 240 to get 440.
s=\frac{800}{2}m
Add 440 and 360 to get 800.
s=400m
Divide 800 by 2 to get 400.
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