Looking for a variable... Tennis balls are sold in packages of three balls.. Numbers are 30,72,378,999,and t. Can't figure out what t equals

Question

Need a variable for this problem. 

Answer 1

Number of individual tennis balls sold= 3t where t is equal to the number of packages sold

 

i.e., if 10 packages were sold:

 

Number of individual tennis balls sold = 3(10) = 30