The ratio of the number of boys and girls in a school is 3:2. If 20% of the boys and 30% of the girls are scholarship holders, the percentage of the students who are not scholarship holders is:
Let the number of boys & girls be 3x and 2x.
Number of those who are not scholarship holders
=(80% of 3x + 70% of 2x = (12x/5 + 7x/5) = 19x/5
Required Percentage = (19x/5 * 1/5x * 100)% = 76%