LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
13 views
in Aptitude by (54.5k points)
closed by

Pen and Pencil can together complete a work in 45 days. The pencil is twice efficient as Pen then find the number of days in which the pen will alone complete the work?


1. 75 days
2. 60 days
3. 135 days
4. 120 days

1 Answer

0 votes
by (53.1k points)
selected by
 
Best answer
Correct Answer - Option 3 : 135 days

Given:

Pen and pencil can together complete a work in 45 days

The pencil is twice efficient as pen

Formula Used:

Work = Efficiency × Time

Calculation:

Let the efficiency of Pen be p then the efficiency of Pencil is 2p

Total work = 45

The efficiency of Pen and pencil = 45/45

⇒ 1

The efficiency of pencil = 1 – p

⇒ 1 – p = 2p

⇒ p = 1/3

The efficiency of Pen = 1/3

Time = 45/(1/3)

⇒ 135 days

∴ The pen will alone complete the work in 135 days.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...