Book Maths Puzzle Numerical Ability

a and b together can complete a work in 36 days b and c together can finish it in 45 days while c and a finish it 60 days. if a work half effeciency and c work twice effeciency. a b and c started the work togather but a left before 4 days of complication and c left three days after a had left. find number of days required to complete the work?

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Book Other Question

Seven years ago at the time of the marriage, the average age of a man and his wife was 28 years. At present they have two children. Their daughter is 2 years older than their son. One year after the birth of the daughter, the average age of the man, wife and their daughter was 21 years. Find the present age of the son. The ratio of Jim`s salary for October to his salary for November was 9:8 and the ratio of the salary for November to that for December was 3:4. The worker got 40 rupees more for December than for October and received a bonus consisting 40 percent of the salary for three months. Find the bonus. (Assume that the number of workdays is the same in every month.)