Subject: General Aptitude · Chapter: Square Roots and Cube Roots · Exam: 2015 · Marks: · Difficulty:
$\sqrt{(2116)}-\sqrt{1600}=\sqrt{(?)}$
(a)20
(b)64
(c)81
(d)36
Answer
Answer (as printed): D
Explanation
Let the number be $x$. Given $\sqrt{2116}-\sqrt{1600}=\sqrt{(x)}$ $$\begin{aligned} & 46-40=\sqrt{(x)} \\ & \Rightarrow 6=\sqrt{x} \\ & \Rightarrow x=(6)^{2}=36 \end{aligned}$$ Hence, the number is 36.
Explanation as extracted from the printed page; notation may be imperfect.