Over the last two years who made more investing in stock market Lisa or Kalley.
(1) Lisa made an average (arithmetic mean) return 20 % while Kalley made an average (arithmetic mean) return of 5%
(2) Kalley started with two times as much money as Lisa
What is the strategy for solving these type of questions?
Obviously both statements alone are not sufficient
Well 'x' represents the amount of money so it has to be positive. Therefore IMO both statetements should be enough
Please advice because I suspect that there may be something wrong with the line of reasoning