Subject: mathqa
Question: on average , the boys in the class have 20 pencils and the girls have 38 pencils . if the overall class average is 30 pencils , what is the ratio of boys to girls in the class ?
Option: 
A: 5 / 6
B: 1 / 2
C: 3 / 4
D: 4 / 5
Answer: D