The ratio of boys and girls in the sixth grade of a certain school is 3:4. After transferring 2 girls, boys are girls (9/19), what is the original number of sixth graders?
某校六年级男女生的比为3：4．转入2名女生后，男生是女生的(9/19)，六年级原有人数是多少人？
<result>65</result>