Solution to "Monkey Business ~ a logic problem"

Anna, orange, by the stream

Harriet, apple, on a rock

Mike, banana, on a tree branch

Sam, pear, on the grass

Sam sits on the grass. Anna sits by the stream. Harriet doesn't sit on the tree branch. So by elimination, Mike sits on the tree branch and Harriet sits on the rock. Since Harriet sits on the rock, she eats the apple. Neither Anna nor Mike ate the pear, so Sam did. Mike doesn't like oranges, so Anna ate the orange and by elimination Mike ate the banana.