{Please don't provide any weblink or any certified answer}
{Source: This Question is from the Question Booklet of Olympiad held for class VII by Silverzone foundation in year 2017} 
Please solve with a proper and easier explanation:
Q). If $\sqrt{6084}=78$, then find the value of $\sqrt{60.84}$ $+\sqrt{0.6084}$ $+$ $\sqrt{0.006084}$