1. $a$, $b$, $c$ and $d$ are 4 integers written in order of size, starting with the smallest. 

The sum of $a$, $b$ and $c$ is 70
The mean of $a$, $b$, $c$ and $d$ is 25
The range of the 4 integers is 14.

Work out the median of $a$, $b$, $c$ and $d$