Solve part-to-part and part-to-whole ratio problems
Use the ratio to find how many items one part stands for. Then multiply that by the number of parts the question asks about.
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In a jar, the ratio of red marbles to blue marbles is 2:3. There are 6 red marbles. How many blue marbles are there?
Answer: 9
In a pencil case, the ratio of black pens to blue pens is 3:1. There are 3 blue pens. How many black pens are there?
Answer: 9
In a bookshelf, the ratio of fiction books to poetry books is 3:4. There are 15 fiction books. How many poetry books are there?
Answer: 20
Tip: Use the ratio to find how many items one part stands for. Then multiply that by the number of parts the question asks about.
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