'He is the boy that won the math olympiad', In this sentence why is there 'that' after the word boy. Instead of it there can be the word 'who'.

In the given sentence, 'that' can replace 'who' which is a relative adverb. 'That' can be used for animate as well as inanimate things.

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This is a common grammatical mistake. In this case 'that' is not appropriate at all, it should be replaced with 'who'. 
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But actually in study material of the subject english in relative pronoun's examples , it is given that after the word boy 
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But actually in study material of the subject english in relative pronoun's examples , it is given that after the word boy 
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