Melany has to fence a 5000 feet square field with wire mesh. If one foot of wire mesh is sold at $30, and she had $120000, how many feet of the field will not be fenced?
Since one-foot wire mesh is sold at $30, with $120000, Melany can buy $120000/$30 = 
<gadget id="calculator">120000/30</gadget>
<output>4_000</output>
4000 feet of wire mesh.
If Melany has to fence 5000 feet of the field and has 4000 feet of wire mesh, she will not fence 5000-4000 = 
<gadget id="calculator">5000-4000</gadget>
<output>1_000</output>
1000 feet of the field.

<result>1_000</result>