Caitlin is very clumsy. She trips up 2two out of 9nine stairs she climbs. If she keeps this up, how many times will Caitlin trip if she walks up ninety stairs? Caitlin lives on the tenth floor of her apartment building and there is no elevator. She has to climb 117one hundred seventeen stairs to get to her apartment. How many times will she trip? How many stairs has she climbed if Caitlin just picked herself up again for ...let's see...the 34th time?
