Question
The efficiency of P is 20% more than the efficiency of
Q, and the efficiency of R is 80% of the efficiency of Q. If P starts with 5/4 of his efficiency along with Q, and after y days, P leaves the work, and R joins Q. The remaining work is completed by Q and R together in 3y days. From the information provided in the above question, which of the following can be determined? A) Find the value of y B) P and Q together can complete the work C) P, Q, and R together can complete 50% of the workSolution
Answer: E Efficiency of Q = 5z Efficiency of P = 5z × 120/100 = 6z Efficiency of R = 5z × 80/100 = 4z If the efficiency of P is 5/4 = 6z × 5/4 = 7.5z Work done: 7.5z × y + 5z × 3y + 4z × 3y = 1 (whole work) Nothing can be determined without the value of y or z.
Which clause is used to sort the results in SQL?
Which SQL clause is used to filter records after aggregation?
Which type of slowly changing dimension (SCD) preserves full history by adding a new row for each change and using effective date ranges?
A Fact Constellation Schema is also called:
What is the primary function of ETL in a data warehouse environment?
Which of the following stores historical data for analysis?
Which of the following is NOT a characteristic of OLAP systems?
Which of the following commands is part of the Transaction Control Language (TCL) in SQL?
Which of the following is a real-time data warehouse application?
Data cleansing is primarily concerned with:
