​$$\sqrt{56.25} + \sqrt{30.25} - \sqrt{12.25} - \sqrt{20.25}$$ = ?

Given:
Expression: $$\sqrt{56.25} + \sqrt{30.25} - \sqrt{12.25} - \sqrt{20.25}$$​​
Solution:
​$$\sqrt{56.25} + \sqrt{30.25} - \sqrt{12.25} - \sqrt{20.25}$$ 

= 7.5 + 5.5 - 3.5 - 4.5
= 13 - 3.5 - 4.5
= 9.5 - 4.5
= 5​
Final Answer
So the correct answer is (a)