Correct Answer - Option 4 : 80
Given:
When 65% of the number is subtracted from itself, the result becomes square root of 784
Concept Used:
Concept of percentage. It is calculated on the basis of 100.
For example, x% means x out of 100
Calculation:
Let, the number be x
65% of x = 65x/100 = 0.65x
Accordingly,
x – 0.65x = √784
⇒ 0.35x = 28
⇒ x = 28/0.35
⇒ x = (28 × 100)/35 = 80
∴ The required number is 80.