What is the amount of urea dissolved per litre, if aqueous solution is isotonic with 10% cane suger soution (mol. wt. of urea = 60)?

A 6% solution of urea is isotonic with

0.06% (w/v) aqueous solution of urea is isotonic with:

The solution which is isotonic with 6% solution of urea is/are is

A 0.6% urea solution would be isotonic with :

30xx10^(-4) kg of urea dissolved in water to make 500 mL aqueous solution and this solution is isotonic with cane - sugar solutions .How much mass of cane sugar in its one litre solutions ? (H=1,N=14,O=16,C=12)