UPSKILL MATH PLUS

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1. Which of the following ratios are in proportion?
 
2. If the ratios formed using the numbers \(2\), \(5\), \(x\), \(20\) in the same order are in proportion, then \(x\) is .
 
3. If \(7 : 5\) is in proportion to \(x : 25\), then \(x\) is .