Square Root and Cube Root - Arithmetic Aptitude Questions and Answers

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If ,3 $\sqrt{5}$ + $\sqrt{125}$ =17.88, then what will be the value of $\sqrt{80}$ + 6 $\sqrt{5}$ ?

13.41

20.46

21.66

22.35

Answer : Option D

Explanation :

3 $\sqrt{5}$ + $\sqrt{125}$ =17.88

3 $\sqrt{5}$ + $\sqrt{25*5}$ = 17.88

3 $\sqrt{5}$ + 5 $\sqrt{5}$ = 17.88

8 $\sqrt{5}$ =17.88

$\sqrt{5}$ = 2.235

$\sqrt{80}$ + 6 $\sqrt{5}$ = $\sqrt{16*5}$ + 6 $\sqrt{5}$

= 4 $\sqrt{5}$ + 6 $\sqrt{5}$

= 10 $\sqrt{5}$ =(10 x 2.235) = 22.35

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