Xiao Ming chose five works, and Xiao Jun chose twice as many as Xiao Ming. How many works did Xiao Jun choose?

Answer: 5x2= 10 (pieces)

Plant Specimens 18, each exhibition board has 6 plant specimens. How many exhibition boards of plant specimens are there?

Answer: 18÷6=3 (pieces)

15 insect specimens * *, and each display panel has 5 insect specimens. How many insect display boards are there?

Answer: 15÷5=3 (pieces)