I've clarified my solution. The final answer (to write in terms of the logs) was given early in the solution. I've just taken it a bit further to illustrate the relationship between logs of different numbers, in particular logs to base 10.
If log implies a different or a general base then the highlighted (bold) solution applies.
My answers are to clarify and explain and perhaps encourage the student to look deeper than the bare question itself and stimulate an interest in the vast subject of mathematics, through which the students can tackle questions themselves with enthusiasm, without having to resort to websites like this just to get their homework done.