When 65 percent of a number is subtracted from itself, then the result becomes square root of 784. What is the number?

Correct option is D

Given:
When 65% of the number is subtracted from itself, the result becomes square root of 784
Solution:
Let, the number be x
​$$x - 0.65x = \sqrt{784} \\\Rightarrow 0.35x = 28 \\\Rightarrow x = \frac{28}{0.35} \\\Rightarrow x = \frac{28 \times 100}{35} = 80$$​​