Mathematics · Time and Work
पिता और पुत्र मिलकर एक काम को 20 दिनों में पूरा कर सकते हैं। यदि पिता अकेला उसी काम को 30 दिनों में पूरा कर सकता है, तो पुत्र अकेला उस काम को कितने दिनों में पूरा करेगा?
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