A false balance has equal arms. An object weigh $X$ when placed in one pan and $Y$ when placed in other pan, then the weight $W$ of the object is equal to
A false balance has equal arms. An object weigh $X$ when placed in one pan and $Y$ when placed in other pan, then the weight $W$ of the object is equal to
- A
$\sqrt {XY} $
- B
$\frac{{X + Y}}{2}$
- C
$\frac{{{X^2} + {Y^2}}}{2}$
- D
$\frac{2}{{\sqrt {{X^2} + {Y^2}} }}$
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- [AIIMS 2018]
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