Final answer:
The translation of 'what's sweet and what's spicy' in Spanish is '¿Qué es dulce y qué es picante?'. The words 'dulce' and 'picante' are used for 'sweet' and 'spicy' respectively.
Step-by-step explanation:
The phrase 'what's sweet and what's spicy' can be translated into Spanish as '¿Qué es dulce y qué es picante?'. When translating phrases from English to Spanish, it's important to maintain the meaning and context of the original language. In this case, 'dulce' translates to 'sweet' and 'picante' translates to 'spicy', and the structure of the question remains similar in both languages.