There were in total 96 pictures (84 pictures + 12 spoiled = 96 pictures). 1 roll of film has 24 pictures. x rolls of film have 96 pictures. 1 : 24 = x : 96 x = 1 * 96 : 24 x = 4
You would need to take 12 and divide it by three . That would make 4. After that you would take 4 and multiply it by 2 since he rode 2/3 miles of 12. Then you would end up with 8.