Question

bet no iitian can solve
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best answer will be awarded as the Einstein answer

Answer 1

Here
500=50(5+x)
500=250+50x
250=50x
x=5

Answer 2

$\frac{100 \sqrt{25} }{ \sqrt{25 } + x} = 50$
$\frac{100 \sqrt{25} }{50} = \sqrt{25} + x$
$2 \sqrt{25} = \sqrt{25} + x$
$x = \sqrt{25}$
so x = 5 or x=-5