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Hi !
It seems that you need to calculate the lateral area for each cylinder. To do that, you will need the height and the radius and you have the values to get each of them.

$$A_L=2\pi\color{#3a9a38}{r}\color{#EC0000}{h}$$
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Next, you will need to calculate the number paint conatainer it needs by dividing the sum of the lateral areas by the area that can be painted by a container. I will let you do the rest of the exercice by your own and if you have any other question, feel free to ask them.
Have a nice evening !