Para llenar un tanque de almacenamiento de gasolina se envió un gasto de 0.1m3 (metro cubico) durante un tiempo de 200s. ¿Qué volumen tiene el tanque?.

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )

he made 11 calls in one day