15
The difference between 82 and 29 is 53.
16
82 - 29 = 53
The two tens, nearest to 53, are 50 and 60. 53 is nearer to 50 (difference = 3) than it is to 60 (difference - 7). So 53, rounded to the nearest 10 is 50.
28
15
The difference between 82 and 29 is 53.
16
682 - 629 = 53
82 - 29 = 53
28
15 degrees is the difference between 68 and 53 degrees Fahrenheit.
The difference is 53 seconds.
26 53-27= 26
The difference is 8. So add half of 8 to 53 : 53 + 4 = 57. Or subtract half of 8 from 61 : 61 - 4 = 57. Either way, the halfway point is 57.
36 is midway between 19 and 53.