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APPSC Group-I Prelims 2019 Paper II · Question 48

Question 48 of the APPSC Group-I Prelims 2019 Paper II (26 May 2019). Try it first, then open the answer and explanation.

  1. Prelims 2019 · P-II · Q48 · Mental Ability & Reasoning · Arithmetic

    A can do a piece of work in 20 days. He works at it for 5 days and then B finishes it in 10 more days. In how many days will A and B together finish the work?

    A ఒక పనిని 20 రోజులలో చేయగలడు. అతడు 5 రోజులు ఆపనిని చేశాక B దాన్ని మరొక 10 రోజుల్లో పూర్తి చేశాడు. అయితే A మరియు B లు కలిసి ఆపనిని ఎన్ని రోజుల్లో చేయగలరు?

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    Answer: 8

    సమాధానం: 8

    In 5 days A does 5/20 = 1/4 of the work. B finishes the remaining 3/4 in 10 days, so B's rate is 3/40 per day. Together: 1/20 + 3/40 = 5/40 = 1/8, i.e. 8 days.

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