Find the next term in the series: $15, 18, 16, 19, 17, 20, ?$

$1 : 8 :: 27 : ?$

In each of the following questions a number series is given. After the series a number is given followed by $(a),$ $(b),$ $(c),$ $(d),$ and $(e).$ You have to complete the series starting with the number given,following the sequence of the original series and answer the questions that follow the series.

$85$	$43$	$44$	$67.5$	$137$	$345$
$125$	$(a)$	$(b)$	$(c)$	$(d)$	$(e)$

What will come in place of $(c)?$

$19, 97, 162, 214, 253, ?$

Find the next term in the sequence: $13, 21, 36, 58, 87, ?$

$1, 5, 11, 19, 29, ?$