Share a total in a three-part ratio
Add all three parts, divide the total by that number, then multiply by the part you want.
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A bag has red, blue and green counters in the ratio 6 : 1 : 5. There are 72 counters in all. How many are blue?
Answer: 6
A bag has red, blue and green counters in the ratio 3 : 2 : 4. There are 36 counters in all. How many are green?
Answer: 16
A bag has red, blue and green counters in the ratio 1 : 4 : 5. There are 40 counters in all. How many are green?
Answer: 20
Tip: Add all three parts, divide the total by that number, then multiply by the part you want.
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