Question
A positive number when decreased by 4 is equal to 21 times the reciprocal of the number. The number is :
Answer: Option C
Was this answer helpful ?
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
Was this answer helpful ?
More Questions on This Topic :
Question 2.
(12)3 x 64 ÷ 432 = ?
....
Question 5.
What is the smallest prime number?
....
Question 8.
378 × ? = 252
....
Latest Videos
Latest Test Papers
Submit Solution