Why do this problem?
is a simple introduction to bar charts which never-the-less requires both logical working and high level thinking. To be successful learners need to understand what the graph is saying and relating that to the information they have been given.
How many different kinds of pets do the class have between them?
How do you know that ...?
Why can't the yellow bar represent ...?
Which bar was the easiest to identify and why?
What can you work out next?
Would it help to write down what you know?
Learners could go on to How Big Are Classes 5, 6 and 7?
or You Never Get a Six