`37 1/2`% of the candidates in an examination were girls . 75% of the boys and `62 1/2`% of the girls passed and
342 girls failed . The number of boys failed was :
Let the total number of candidates be `x`. Then, `(100 - 62 1/2)`% of `37 1/2`% of `x` = 342
`hArr 75/2 xx 1/100 xx 72/2 xx 1/100 xx x = 342 hArr (9x)/64)= 342 hArr x = ((342 xx 64)/(9))` = 2432
Number of boys failed = (100 - 75)% of `(100 - 37 1/2)`% of 2432
= `(25/100 xx 125/2 xx 1/100 xx 2432)` = 380.
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