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What is the value of x in 5: 7:: 20: x?

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answer is A.

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Detailed Solution

Given, 5: 7:: 20: x.
We know that, the product of extremes = the product of means.
So,

5 x = 7 \times 20

x = \frac{140}{5}

x = 28
So, the value of x is 28.
Hence, option 1 is correct.

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