9514 1404 393
Answer:
5n : 7n . . . for any non-zero real number n
Explanation:
The terms in the given ratio both have a factor of 5. When that is factored out, the ratio reduces to ...
25 : 35 = (5)(5) : (5)(7) = 5 : 7
Equivalent ratios can be made by multiplying both parts of the ratio by the same number, any non-zero number. There are an infinite number of equivalent ratios. They can be expressed as ...
5n : 7n . . . for any non-zero n
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Additional comment
We assume your question actually has a list of possibilities from which you are to choose. If you divide the second number in the ratio by the first, you will get 7/5 = 1.4 for any equivalent ratio. A calculator and/or knowledge of multiplication facts can be of help.