Question
Worker A can build a wall alone in 30 days. When A and B
work together, they can complete the wall in 16 days. If B starts building the wall alone and works for 20 days before leaving, how many additional days will A need to finish the remaining work alone?Solution
Let the total work to be done to build the wall = L.C.M of 30 and 16 = 240 units
Then, efficiency of ‘A’ = 240 ÷ 30 = 8 units/day
Combined efficiency of ‘A’ and ‘B’ = 240 ÷ 16 = 15 units/day
So, efficiency of ‘B’ = 15 – 8 = 7 units/day
Work done by ‘B’ in 20 days = 7 × 20 = 140 units
Remaining work = 240 – 140 = 100 units
Time taken by ‘A’ to complete the remaining work = 100 ÷ 8 = 12.5 days
Which of the following is an Electrical pathway to transfer data among different parts of the computer?
Which of the following operating systems can be classified as both, multitasking and multiprogramming?
(i) MS-DOS
(ii) Windows 10
(iii) Linux
Examples of fax machines and imaging systems fall under the category of:
Function to find out how much money you will have in the bank in you invest over a fixed period, using a fixed rate of interest.
In first generation of computers, they used ___________
It is used to connect a pen drive to computer.
What is the purpose of the BIOS (Basic Input/Output System) in a parent computer?
Which of the following represents the smallest unit of data in a computer?
Which of the following operating system is used developed by Microsoft?
What does E-commerce enable companies to do?
Relevant for Exams:
