The average age of P, Q, R, and S is 30 years. How old is R? Statement I - The sum of ages of P and R is 60 years. Statement II - S is 10 years younger than R.
A and B together can complete a task in 7 days. B alone can do it in 20 days. What part of the work was carried out by A? Statement I - A completed the job alone after A and B worked together for 5 days.Statement II - Part of the work done by A could have been done by B and C together in 6 days.