Problema Solution
mary had a number of cookies. after eating one, she gave the remainder to her sister. after eating another cookie, she gave half of what was left to her brother. mary now had only five cookies. how many cookies did she start with?
Answer provided by our tutors
She had 5 left after she gave half to brother, so she had 10 before that, plus the cookie she ate gave her 11 which equals the half she gave her sister for a total of 22, plus the first one she ate is 23.