IBPS Government Jobs Exams Numerical Ability Time and Work

A and B working alone can complete a work in 30 and 15 days respectively. If 50% of the work is completed by C in 3x days and the remaining work is completed by A and B working together in x days, then find the time taken by B and C together to complete the work.
A) 15 days B) 18 days C) 12 days D) 10 days E) None of these

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IBPS Other Question
The ratio of incomes of A and B in 2017 is 2:3 and ratio of incomes of A in 2017 and 2018 is 4:5. Find the expenditure of A in 2018 if saving in the same year is Rs. 4000. It is given that in 2017 sum of income of A and B is Rs. 25000.
A) Rs. 8000 B) Rs. 9500 C) Rs. 8500 D) Rs. 10000 E) Rs. 10500 What should come in place of the question mark (?) in the following number series?
?, 7, 8, 13, 27, 68.5
A) 2 B) 3 C) 5 D) 12 E) 10