Final answer:
To find out what fraction of the pizza was left for their friend: 1 - (2/3) - (1/12).
Step-by-step explanation:
To find out what fraction of the pizza was left for their friend, we need to subtract the fractions of the pizza that Kim and Deirdre ate from 1 (since 1 represents the whole pizza).
Kim ate (2/3) of the pizza, so the fraction left for their friend is 1 - (2/3) = 1/3.
Deirdre ate (1/12) of the pizza. Since this fraction is very small compared to the fraction Kim ate, it can be ignored when calculating the fraction left for their friend.