Question
‘A’ alone can complete a work in 50 hours. ‘A’
started the work alone and left after working on it for 20 hours. If ‘B’ completed the rest of the work in 10 hours then find the time taken by ‘A’ and ‘B’ together to complete the whole work.Solution
Let the total work = 200 units Then, efficiency of ‘A’ = (200/50) = 4 units/hour Work completed by ‘A’ alone in 20 hours = 4 × 20 = 80 units Remaining work = 200 – 80 = 120 units So, efficiency of ‘B’ = 120/10 = 12 units/hour Therefore, combined efficiency of ‘A’ and ‘B’ = 12 + 4 = 16 units/hour So, time taken by ‘A’ and ‘B’ together to complete the work = (200/16) = 12.5 hours
In descriptive statistics, what is the main advantage of using the median over the mean as a measure of central tendency in data analysis?
Which of the following is the primary reason why bias occurs in sampling?
In descriptive statistics, which of the following measures is least affected by extreme values (outliers)?
When performing trend analysis for forecasting sales, which of the following methods is most commonly used to identify future trends based on historical...
Which of the following best differentiates random sampling from non-random sampling techniques?
Which of the following is a key advantage of 5G technology over 4G in mobile computing?
A dataset contains customer email addresses, and you need to validate the email format. Which of the following methods is most suitable for this task? <...
Which of the following techniques is most suitable for handling and organizing an unstructured dataset with textual data?
In Python, which library is most commonly used for data manipulation?
Which of the following is true regarding the use of pivot tables in Excel for data analysis?
Relevant for Exams:
