Four runners ran a combined total of 195 miles last week. Katarina ran 51 miles. Tomas, Tyler, and Harriet all ran the same distance. How many miles did Harriet run?
195 - 51 = 144 = miles the 3 runners ran
144/3 = 
<gadget id="calculator">144/3</gadget>
<output>48</output>
48 miles.
Harriet ran 
<gadget id="calculator">48</gadget>
<output>48</output>
48 miles.

<result>48</result>