3 Views

Question : A can do $\frac{1}{3}$ of a work in 30 days. B can do $\frac{2}{5}$ of the same work in 24 days. They worked together for 20 days. C completed the remaining work in 8 days. Working together A, B and C will complete the same work in:

Option 1: 15 days

Option 2: 10 days

Option 3: 18 days

Option 4: 12 days


Team Careers360 21st Jan, 2024
Answer (1)
Team Careers360 23rd Jan, 2024

Correct Answer: 12 days


Solution : A can do $\frac{1}{3}$ of a work in 30 days. So, A can finish the complete work in 90 days if working alone.
⇒ 1 day work of A = $\frac{1}{90}$
B can do $\frac{2}{5}$ of a work in 24 days. So, A can finish the complete work in 60 days if working alone.
⇒ 1 day work of B = $\frac{1}{60}$
So, 1 day work of both A and B = $\frac{1}{90}$ + $\frac{1}{60}$ = $\frac{1}{36}$
Work done by A and B together in 20 days = 20 × $\frac{1}{36}$ = $\frac{20}{36}$
Remaining work = 1 – $\frac{20}{36}$ = $\frac{4}{9}$
This work is done by C in 8 days.
So, 1-day work of C = $\frac{\frac{4}{9}}{8}$ = $\frac{1}{18}$
1 day work of (A + B + C) = $\frac{1}{36}$ + $\frac{1}{18}$ = $\frac{1}{12}$
So, the time taken by (A + B + C) =  $\frac{1}{\text{1 day work of A, B, and C}}$  = $\frac{1}{\frac{1}{12}}$ = 12 days
Hence, the correct answer is 12 days.

SSC CGL Complete Guide

Candidates can download this ebook to know all about SSC CGL.

Download EBook

Know More About

Related Questions

TOEFL ® Registrations 2024
Apply
Accepted by more than 11,000 universities in over 150 countries worldwide
Manipal Online M.Com Admissions
Apply
Apply for Online M.Com from Manipal University
View All Application Forms

Download the Careers360 App on your Android phone

Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile

150M+ Students
30,000+ Colleges
500+ Exams
1500+ E-books