"We drink a juice and you eat the rice."
Translation:Noi bem un suc și voi mâncați orezul.
"Iar" is an adverb, but also a conjunction. https://gramaticalimbiiromane.ro/morfologia/parti-vorbire-neflexibile/conjunctia/ (Sorry, it's in Romanian.)
Most of the time it can be replaced with "și", although its exact purpose is to express a difference in two actions.
"Iar" always separates two independent sentences, unlike "și", that can also be used between two parts of sentence of the same kind (as in "Ea și el mănâncă", or "Ea mănâncă și bea").
Here in the heading, both the question (lesson) and answer are correct.
However, in the lesson the answer doesn't reflect with the question!
If the answer is "Noi bem un suc şi mancaţi orezul", then the question should be "We drink a juice and eat the rice" (omitting the "you").
Maybe, by the time you read this, the error has been corrected. :)