Only ii,iii,iv need to answrt

Dear Student,

(ii) 39 litres:65 litres and 6 bottles:10 bottles
       39   =  39 ​÷ 13   =   3    and   6   =   6 ​÷ 2   =   3 
       65        65 ​​÷ 13       5            10      10 ​÷ 2        5
      Hence they are  in proportion.

(iii) 200 mL:2.5 L and Rs 4:Rs 50 (or) 200 mL:2500 mL and Rs 4:Rs 50
        200   =   2   and   4   =   4 ​÷ 2   =    2  
       2500      25           50       50 ÷ 2       25
     Hence, they are in proportion.

(iv) 2 kg:80 kg and 25 g:625 kg  (or)  2 kg:80 kg and 25 g:625000 g
        2   =  2 ​÷ 2    =   1    and   25      =   25 ​÷ 25     =     1   
       80      80 ​÷ 2       40         625000    625000 ​​÷ 25     25000
        Hence, they are not in proportion.

Regards!