Ratios: find the other group when you know one count

Use the ratio to find how many are in one part, then find the other group.

1. The ratio of apples to oranges is 3 : 2. There are 4 oranges. How many apples are there?
2. The ratio of boys to girls is 4 : 3. There are 8 boys. How many girls are there?
3. The ratio of guitars to drums is 2 : 1. There are 3 drums. How many guitars are there?
4. The ratio of apples to oranges is 2 : 4. There are 12 oranges. How many apples are there?
5. The ratio of tulips to daffodils is 1 : 5. There are 2 tulips. How many daffodils are there?
6. The ratio of cats to dogs is 4 : 2. There are 8 cats. How many dogs are there?
7. The ratio of boys to girls is 4 : 6. There are 18 girls. How many boys are there?
8. The ratio of fiction books to non-fiction books is 5 : 2. There are 20 fiction books. How many non-fiction books are there?
9. The ratio of guitars to drums is 1 : 7. There are 70 drums. How many guitars are there?
10. The ratio of cats to dogs is 6 : 4. There are 48 cats. How many dogs are there?
11. The ratio of cats to dogs is 4 : 8. There are 48 dogs. How many cats are there?
12. The ratio of pencils to pens is 3 : 6. There are 30 pens. How many pencils are there?
13. The ratio of cars to bikes is 4 : 3. There are 48 cars. How many bikes are there?
14. The ratio of cars to bikes is 8 : 1. There are 9 bikes. How many cars are there?
15. The ratio of guitars to drums is 8 : 9. There are 80 guitars. How many drums are there?
16. The ratio of red marbles to blue marbles is 3 : 5. There are 18 red marbles. How many blue marbles are there?
17. The ratio of guitars to drums is 6 : 9. There are 30 guitars. How many drums are there?
18. The ratio of boys to girls is 5 : 9. There are 45 girls. How many boys are there?
19. The ratio of cars to bikes is 4 : 2. There are 44 cars. How many bikes are there?
20. The ratio of pencils to pens is 10 : 9. There are 90 pencils. How many pens are there?