The diagrams in Fig.1 show that once a matching has been established between boys and bananas, the pupils were able to determine with ease the critical step 12 x 4.
Izzudin's example is the most common type.
Termizi shows a slight variation.
Hasnal drew 4 bananas but did not proceed beyond the second pupil; this was sufficient to enable him to establish the matching between pupils and bananas.
Pamela's diagram even shows a waste bin for the bad bananas but the representation of the twelve pupils enabled her to obtain 4x12.
Rebecca's diagram shows a literal representation of the major elements of the problem but no matching of boys and bananas is evident