1. A school choir has 45 members in total. If it is known that there are 26 sopranos, the number of altos in the choir must be ___.
2. A bag contains 150 red and blue marbles. The ratio of red to blue is 3 to 2. If there are 90 red marbles, how many blue marbles are there?
3. In a class of 30 students, the ratio of boys to girls is 2:3. You correctly calculate that there are 12 boys. What is the correct next step to find the number of girls?
4. A parking lot contains 77 cars and trucks in a ratio of 5 to 6. If there are 35 cars, then there must be ___ trucks.
5. The ratio of vanilla to chocolate milkshakes sold was 2 to 7. If a total of 81 milkshakes were sold, how many were chocolate? ___
6. A bag contains only red and blue marbles. The ratio of red marbles to blue marbles is 3:7. If there are 50 marbles in total, how many of them are red? ___
7. The ratio of dogs to cats at an animal shelter is 2:3. What fraction of the total animals at the shelter are cats?
8. In a class election, the ratio of votes for Candidate A to Candidate B was 9:4. If a total of 65 votes were cast, how many votes did Candidate A receive? ___
9. A fruit punch recipe has a ratio of 5 parts orange juice to 2 parts pineapple juice. To make 28 gallons of punch, which proportion correctly finds $p$, the gallons of pineapple juice?
10. The ratio of girls to boys in a science class is 3:4. If there are 35 students in total, how many boys are in the class? ___