Dr. Banks had 330 toothbrushes to give away to his patients. He gave away 53 toothbrushes in January. He gave away 67 toothbrushes in February. In March he gave away 46 toothbrushes. In April and May, he gave away the remaining toothbrushes, half each month.  How many more toothbrushes did Dr. Banks give out in the busiest month versus the slowest month?
Through March, Dr. Banks gave out 53 + 67 + 46 = <<53+67+46=166>>166 toothbrushes.
Before giving away toothbrushes in April, he had 330 -166 = <<330-166=164>>164 toothbrushes remaining.
Between April and May, he gave out the remaining 164 / 2 = <<164/2=82>>82 toothbrushes each month.
Dr. Banks gave 82 toothbrushes in his busiest month and 46 toothbrushes during the slowest month.
The difference would be 82- 46 = <<82-46=36>>36 more toothbrushes in the busiest month.
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