The Grade 8 and Grade 9 students at Pascal S.S. were surveyed about puzzles. Their responses are summarized in the chart shown, but two of the entries in the chart were erased. In total, how many Grade 9 students were surveyed?
A total of 140 of the students surveyed don’t like puzzles. Since 92 of these students were in Grade 8, then 140−92=48 Grade 9 students don’t like puzzles. Since 68 Grade 9 students do like puzzles and 48 do not, then the number of Grade 9 students surveyed was 68+48=116.