Question

Square of a number less than 20 times of itself by 75. Find one-third of the number.
1) 15
2) 5
3) 20
4) 18​

Answer 1

Step-by-step explanation:

x²+ is less than 20x x2+/75

75x²=20x²

75/20x1/3 solve this u get urs answer perfectly

Answer 2

Answer:

2) 5

Step-by-step explanation:

Let the number be $x$ .

Then according to question:

$20x - 75 = x^{2}$

Rearranging the term, we get:

$x^{2} -20x + 75= 0\\x^{2} -15x -5x + 75=0\\x(x-15) - 5(x-15) = 0\\(x-5)(x-15) = 0$

So $x =5$ or $x=15$

Case1: $x =5$

Then, one third of $x = 5/3$

Case2: $x=15$

Then, one third of $x = 15/3 = 5$

Hence, answer is 2) 5