In a class of 150 students, 40 passed in Social Studies, 90 passed in Science and 30 failed in both the subjects.
i) How many students passed in at most one subject among Science and Social Science?
a) 100
b) 110
c) 140
d) 150

ii) How many students passed in Science but failed in Social Studies?
a) 70
b) 10
c) 90
d) 80

• i) b) 110
  
  Total students passed in either one or both the subjects=150-30=120
  So students passed in both the subjects=(40+90)-120=10
  Students passed only in Social studies=40-10=30
  Students passed only in Science=90-10=80
  So students passed in at most one subject=Students passed only in Social studies+Students passed only in Science=30+80=110
  
  ii) d) 80
  Students passed in science but failed in Social studies=80
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