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Disco Ratios
Problem
The ratio of boys to girls at a school disco is 9:10.
An extra 17 boys arrive and the ratio changes to 8:7.
How many girls are there at the disco?
Problem ID: 131 (Nov 2003) Difficulty: 2 Star
The ratio of boys to girls at a school disco is 9:10.
An extra 17 boys arrive and the ratio changes to 8:7.
How many girls are there at the disco?
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