Question

The square of a positive number is 2000% greater than the number itself, then the square of that number is :
A.1762
B.1635
C.441
D.139

Answer 1

let the no. be x
then
x*x=x+x*2000/100
${x }^{2} = x + 20x \\ {x }^{2} - 21x = 0 \\ x = 21$
square of 21=441

Answer 2

Answer:

Option C - 441

Step-by-step explanation:

Given : The square of a positive number is 2000% greater than the number itself.

To find : The square of that number is?

Solution :

Let the no. be x

According to question,

$x\times x=x+x\times \frac{2000}{100}$

$x^2=x+x\times 20$

$x^2-21x=0$

$x=21$

Square of the number,

$21^2=441$

Therefore, Option C is correct.