yz-single-question--A-is-thrice-as-good-as-workman-as-B-and-therefore-is-able-to-finish-a-job-in-60-days-less-than-B--Working-together,-they-can-do-it-in-:--BD-Merit-Freelancing,-BCS,-Bank,-Primary,-Admission,-NTRCA

1 . A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in :

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Answer: Option B

Explanation:

Let, A can finish the job in x days

B can finish the job in 3x days.

According to the question

3x - x = 60

2x = 60

x = 30 days

B can finish the job in 3 × 30 or, 90 days

In 1 day A can finish 1/30 th job

In 1 day B can finish 1/90 th job

In 1 day both A and B can finish 1/30 + 1/90 th job

= 3 + 1 /90 = 2/45 th

both A and B can finish the job in 1/2/45 = 22.5 days.

Bangladesh Bank - Assistant Director - 2011

প্রিমিয়াম প্ল্যান: ১ মাস

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