Me and Sakae made this strategy DLO to show our thinking. The question we had to answer was, 381 marathon runners started a race. How many finished the race if 127 retired before the end?
So we took away 81 from 381 and we got 300 then we took away 127 from the 300 and we got 173. After that we brought the 81 and 173 back and added them together and the answer was 254. Which means 254 runners finished the race.
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