Ratios: find the other quantity
Find what one part is worth, then multiply by the number of parts you need.
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The ratio of apples to oranges is 4 : 9. There are 36 apples. How many oranges are there?
Answer: 81
The ratio of boys to girls is 3 : 1. There are 27 boys. How many girls are there?
Answer: 9
The ratio of boys to girls is 9 : 10. There are 54 boys. How many girls are there?
Answer: 60
Tip: Find what one part is worth, then multiply by the number of parts you need.
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- Next in this topic Ratios: find the first quantity Grade 7
- Need a warm-up? Write a ratio from a situation Grade 6
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- Mix It, Pace It: Ratio, Rate and Percent Grades 6–7 · printable lessons
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