CLEAR
Toprankers-Info

+91 7676564400

Mobile App

Get it on Google Play
Discussions
Select Date
Tags:

Articles

Discussions
Submit Discussion
ayushi sharma

· started a discussion

· 1 Months ago

wrong solution (Question: 496590.0 )

"They begin together" means A+B both working together..their combined efficiencies will be 5 units.Please correct it

Question:

A can do a piece of work in 14 days which B can do in 21 days. They begin together but 3 days before the completion of the work, A leaves off. The total number of days to complete the work is

Options:
A)

635    days

B)

812    days

C)

1015    days

D)

1312    days

Solution:

Ans: (c)

LCM(14,21)=42.
Let total work is 42 units where
work done by A in 1 day =\(\frac{42}{14}\) = 3 =4214=3 units
work done by B in 1 day =\(\frac{42}{21}\) = 2=4221=2 units

A and B together can do 3+2=5 units of work in 1 day. Since they worked together for 7 days, 5×7=35 units of work gets completed.
Remaining work =42−35=7 units
B can complete this remaining work in 72=3.5 days.
Required days =7+3.5=10.5

Knowledge Expert

· commented

· 1 Months ago

Dear student
We have updated the solution.

Keep learning
Team TR
-logo
We at aim to provide most comprehensive content & test for practice which is carefully divided into various chapters and topics to help you focus on your weak areas.Our Practice mock test gives you unmatched analytics to help you realize your strong areas,time management and improvement areas.Our Short & Crisp notes on each topic will help you to quickly revise the topic along with the tips & tricks of the exams.
More About
-Info
-Info

Mobile App

Get it on Google Play
About Us Campus Ambassador Careers Contact Us Refund Policy

All Rights Reserved Top Rankers

User Policy
Disclaimer
Terms & Conditions