11. a. If you are cooking 1/2 c of rice you will need 1 c of water, so in total you will need 1 + 1/2 = 1 1/2 c of ingredients.
b. She is correct. Multiplying both parts of the ratio by two would give you a ratio of 2:1. Multiplying and dividing ratios is okay and often done to remove fractions from ratios.
12. a. If the team won 3 games and lost 2 games, then they played a total of 5 games.
Ratio of wins to games played is 3:5
b. No you cannot. The ratio does not tell you absolute amount. It just shows the relative number when compared to the number of games that were one. For example, they could have played 15 games, winning 9 and it would still have the same ratio.