Prove that if $P$ is a $p$-Sylow subgroup of $G$ and $N \triangleleft\> G$ then:
$ PN/N $ is a $p$-Sylow subgroup of $G/N$
$P \cap N $ is a $p$-Sylow subgroup of $N$
Prove that if $P$ is a $p$-Sylow subgroup of $G$ and $N \triangleleft\> G$ then:
$ PN/N $ is a $p$-Sylow subgroup of $G/N$
$P \cap N $ is a $p$-Sylow subgroup of $N$
Better than writing this out, you better read this excellent expository paper by Keith Conrad, Corollary 6.5 and Theorem 6.7.