W:C = 5:2
C:M = 5:11
So W:C:M = 25:10:22 INSUFF
Using W:C = 5:2 and Total W < 30 is INSUFF
S1 and S2:
As W:C:M = 25:10:22 then the cases of real number of people are (25,10,22) or (50,20,44) or (75,30,66) and so on. But total women are less than 30 so we can determine that there were 25 women and 10 children and 22 men.
SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008