Ratios: find the total
Find what one part is worth, then multiply by the number of parts you need.
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The ratio of boys to girls is 8 : 3. There are 72 boys. How many boys and girls are there in all?
Answer: 99
The ratio of red marbles to blue marbles is 2 : 8. There are 4 red marbles. How many red marbles and blue marbles are there in all?
Answer: 20
The ratio of fiction books to non-fiction books is 6 : 9. There are 48 fiction books. How many fiction books and non-fiction books are there in all?
Answer: 120
Tip: Find what one part is worth, then multiply by the number of parts you need.
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- Mix It, Pace It: Ratio, Rate and Percent Grades 6–7 · printable lessons
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