One year ago the ratio of the ages of two sister was 2 : 3. The sum of their present ages is 12. What are their ages now?
5, 7
Our result (5, 7) matches Option 1. Pay close attention to whether the information given refers to past ages (e.g., '5 years ago'), present ages ('now'), or future ages (e.g., 'in 10 years').
There are fourteen teams playing in a tournament. If every team plays one match with every other team, how many matches will be played in the tournament?