Lionel walked 4 miles. Esther walked 975 yards and Niklaus walked 1287 feet. How many combined feet did the friends walk?
Lionel = 4 * 5280 = 
<gadget id="calculator">4*5280</gadget>
<output>21_120</output>
21120 feet.
Esther = 975 * 3 = 
<gadget id="calculator">975*3</gadget>
<output>2_925</output>
2925 feet.
Together = 21120 + 2925 + 1287 = 
<gadget id="calculator">21120+2925+1287</gadget>
<output>25_332</output>
25332 feet.
Together the friends walked 25332 feet.

<result>25_332</result>