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Question

If 9, x, x and 49 are in proportion, find the value of x.


A
7
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B
14
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C
21
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D
35
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Solution

The correct option is C 21

Given: 9, x, x, 49 are in proportion i.e. 9:x :: x:49
9x=x49
x×x=9×49
x×x=441
x×x=21×21
x=21


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