Question Number 70197 by smartsmith459@gmail.com last updated on 01/Oct/19
Commented by mr W last updated on 01/Oct/19
$${in}\:{the}\:{first}\:\mathrm{27}\:{days}\:{it}\:{climbs}\:\mathrm{27}{m}. \\ $$$${in}\:{the}\:\mathrm{28}{th}\:{day}\:{it}\:{escapes}\:{from}\:{the} \\ $$$${pit}.\:\Rightarrow{totally}\:\mathrm{28}\:{days} \\ $$