Answer:
 Jug B can hold 2340 ml.
Step-by-step explanation:
Given 
The amount in Jug A = 1800ml
To determine
How much does jug B hold?
Give that the Jug B holds 3/10 more, i.e.

Thus, 
The total amount in Jug B = 540+1800
                                            = 2340 ml
Therefore, Jug B can hold 2340 ml.