Manhattan 5lb page no 623 q no 23

PLEASE EXPLAIN:
The outcome of a standardized test is an integer between 151 and 200, inclusive. The percentiles of 400 test
scores are calculated, and the scores are divided into corresponding percentile groups.

Quantity A

Minimum number of integers between 151 and 200,
inclusive, that include more than one percentile group

Quantity B
Minimum number of percentile
groups that correspond to a score of
200

Ans is A