In an examination, 35% candidates failed in one subject and 42 % failed in another subject while 15% failed in
both the subjects . If 2500 candidates appeared at the examination, how many passed in either subject but not in
both ?
Failed in 1st subject = `(35/100 xx 2500)`= 875.
Failed in 2nd subject = `(42/100 xx 2500)` = 1050
Failed in both = `(15/100 xx 2500)` = 375.
Failed in 1st subject only = 875 - 375 = 500
Failed in 2nd subject only = 1050 - 375 = 675
`:.` Passed in 2nd only + passed in 1st only = 675 + 500 = 1175.
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