Question

4 L 342 mL + 2L 214 mL =

Answer 1

your answer will be 6 L 556 ML 

Answer 2

let's convert the data into ml.
4l 342ml= 4342 ml
2l 214 ml= 2214 ml

4342+2214= 6556 ml

convert it to L= 6556 ml = 6 L 556 ml