Xavier_Khan: 30/06/2014 Β· Fill the box using (1,3,5,7,9,11,13,15) You can also repeat the number ββ + ββ + ββ- = 30. Answer :-> Blank-> 15-> 15 ____+15+15 = 30. Reply. kumar kiran says. May 26, 2015 at 7:07 am. Not possible to answer ..as the sum β¦50 months ago