Benchmarking is the process of comparing one's business proceses and performance metrics to industry bests or best practices from other industries. Dimensions typically measured are quality, time and cost.
4 years ago, the respective ratio between 1/2 of A’s age at that time and four times of B’s age at that time was 5 : 12. Eight years hence 1/2 of A’s age at that time will be less than B’s age at that time by 2 years. What is B’s present age ?