Question

n multiply 5 ki power 4 divide by n2ki power 2 equal to 5

Answer 1

$\frac{n \times 5 {}^{4} }{2n {}^{2} } = 5$
$= \frac{5 {}^{4} }{2n} = 5$
by cross multiplication
$10n = {5}^{4} \\ n = \frac{ {5}^{4} }{10} \\ n = \frac{625}{10} \\ n = 62.5$
hope it helps