Ratios: use the difference to find the total
The difference between the parts is a known number of items. Use it to find one part, then the total.
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The ratio of apples to oranges is 4 : 1. There are 15 more apples than oranges. How many pieces of fruit are there in all?
Answer: 25
The ratio of hens to ducks is 3 : 2. There are 4 more hens than ducks. How many birds are there in all?
Answer: 20
The ratio of fiction books to non-fiction books is 2 : 1. There are 2 more fiction books than non-fiction books. How many books are there in all?
Answer: 6
Tip: The difference between the parts is a known number of items. Use it to find one part, then the total.
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- Next in this topic Map scale problems Grade 6
- Ready for more Ratios: find the other quantity Grade 7
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- Mix It, Pace It: Ratio, Rate and Percent Grades 6–7 · printable lessons
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