The sum of the present ages of mark and his mother is 60 years. In 6 years she will be twice as old as he will be. Find there present ages

The answer to your question is b’(16,14)

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.