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Question

A positive number when decreased by 4 is equal to 21 times the reciprocal of the number. The number is :


Options:
A .  3
B .  5
C .  7
D .  9
Answer: Option C

Let the number be `x`.

Then , `x - 4` = `21/x`   `hArr`  `x^2 - 4x 21` = 0  `hArr` `(x - 7) ( x + 3)` = 0    `hArr`     `x` = 7




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