Bob and his colleagues from ABC university based their findings on 5000 boys and 4900 girls between the ages of 10 and 18 - a third of whom had smoked - who were examined between 1974 and 1989.
My questions are: 1) why do they use 'whom'? I don't see an object that 'whom' can refer to. 2) 'who' refers to what?
Thank you so much
Top answer
whom - object of preposition of who -relative pronoun referring to 'boys and girls'
— Philip
whom - object of preposition of who -relative pronoun referring to 'boys and girls'
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