Question
A completes 37.5% of a task in 9 days, B finishes 44.44%
of the same task in 8 days, and C accomplishes 66.67% in 8 days. How many days will it take for A, B, and C to jointly complete 65% of the task?Solution
A will complete whole work in 9 × 8/3 = 24 days B will complete whole work in 8 × 9/4 = 18 days C will complete whole work in 8 × 3/2 = 12 days Let total amount of work = 72 units (LCM of 24, 18 and 12) Efficiency of A, B and C is 3, 4 and 6 respectively 65% of total work = 72 × 0.65 units Desired time taken = (72 × 0.65)/13 = 72 × 0.05 = 3.6 days Hence, option a.
Which of the following ACID properties ensures that either all operations within a transaction are completed successfully, or none are?
Which constraint ensures that a column contains only unique values, but allows NULL values?
Query optimization heuristics often include:
Given a `Queue` data structure with `enqueue` and `dequeue` operations. What is the element returned by the last `dequeue` operation in the following se...
During transaction before commit which of the following statements is done automatically in case of shutdown?
Indexes improve query performance but can degrade performance of:
The 'thrashing' in an operating system is related to:
Which property of a transaction ensures that either all operations within the transaction are completed successfully, or none of them are?
In a relational database, what is a candidate key?
In a relational database, which relationship allows multiple records in one table to be associated with multiple records in another table?
Relevant for Exams:
