Question

Brian concluded that he is 5/7 times as old as his friend.

Answer 1

As given by the question

There are given that the statement,

Brain 21-year-old that wanted to know how many times old he is then a 15-year old friend.

Now,

The equation:

`\begin{gathered} x=(15)/(21) \\ x=(5)/(7) \end{gathered}`

Hence, the above two equations are correct.