Un restaurante local vendió un total de 429 hamburguesas y emparedados el sábado. Se vendieron 71 emparedados menos que hamburguesas. ¿Cuántas hamburguesas se vendieron el sábado?

there are infinitely many solutions.

i believe a. 12x≥120 is the answer

large crystals result from very slow cooling.

evaporation of water: this would produce an evaporite which is a sedimentary rock. like a salt pan in a desert. not possible to have volcanic rocks originate this way.

crystalization in molten earth: slow cooling over time. (hundreds to millions of years)

crystalization at earth's surface: this results in fast cooling. (a few hours to a few months or years)

crystalization from cooling off hot water: that would be a hydrothermal deposit. while associated with volcanics they are not volcanic rocks themselves and usually occur fairly rapidly.