Question
Pierre celebrates his birthday today. 13 years ago, he was thrice as old as his daughter while his wife was 20 years older than her. If his wife is 50 years old this year, how old was Pierre last year?
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Pierre celebrates his birthday today. 13 years ago, he was thrice as old as his daughter while his wife was 20 years older than her. If his wife is 50 years old this year, how old was Pierre last year?