In Rita's class boys and girls are in the ratio of 1:2. From top Rita ranks 8th among girls and 17th among all students. If her rank from the bottom among all students is 20th, how many boys are these below Rita in the class?
Options:
A .  4
B .  1
C .  9
D .  Data inadequate
E .  None of these
Answer: Option E
Total students in the class = (20 + 17 - 1) = 36Using given ratio 1:2, boys = 12, girls = 24, since Rita is a girl,there are (17 - 8) = 9 boys above Rita.Hence (12 - 9) = 3 boys are below Rita.
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