Question
Download Solution PDFA can do a piece of work in 4 days. B can do it in 20 days. With the assistance of C, they completed the work in 2 days. C alone can do it in _______ days.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
A can do a piece of work in 4 days.
B can do a piece of work in 20 days.
With the assistance of C, they completed the work in 2 days.
Formula used:
Work done by A in 1 day = 1/4
Work done by B in 1 day = 1/20
Work done by A, B, and C together in 1 day = 1/2
Calculations:
Work done by A, B, and C together in 1 day = Work done by A in 1 day + Work done by B in 1 day + Work done by C in 1 day
⇒ 1/2 = 1/4 + 1/20 + 1/C
⇒ 1/C = 1/2 - 1/4 - 1/20
⇒ 1/C = (10 - 5 - 1) / 20
⇒ 1/C = 4/20
⇒ C = 5 days
∴ The correct answer is option 2.
Last updated on Jun 16, 2025
-> The RRB Technician 2025 Vacancies have been announced in the Employment Newspaper.
-> As per the Notice, around 6180 Vacancies will be announced for the Technician 2025 Recruitment.
-> The Online Application form for RRB Technician will be open from 28th June 2025 to 28th July 2025.
-> The Pay scale for RRB Technician posts ranges from Rs. 19900 - 29200.
-> Prepare for the exam with RRB Technician Previous Year Papers.