So,
35% of 55% is equal to the percent of boys on honor roll in the student body.
100 - 55 = 45%, which is the percent of girls in the student body.
40% of 45% is equal to the percent of girls on honor roll in the student body.
35% * 55% = 19.25%
40% * 45% = 18%
Adding them up, we get:
19.25 + 18 = 37.25%
Round it to the nearest percent.
37.25 --> 37%
Rounded to the nearest percent, 37% of the student body is on honor roll.