11.  The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is: 
a.  17 kg 
b.  20 kg 
c.  26 kg 
d.  31 kg 
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Answer: (d).31 kg

12.  The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weights of all the boys in the class. 
a.  47.55 kg 
b.  48 kg 
c.  48.55 kg 
d.  49.25 kg 
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Answer: (c).48.55 kg

13.  A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is: 
a.  250 
b.  276 
c.  280 
d.  285 
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Answer: (d).285

14.  If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is: 
a.  53.33 
b.  54.68 
c.  55 
d.  None of these 
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Answer: (b).54.68

15.  A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half (1/2). The number of pupils in the class is: 
a.  10 
b.  20 
c.  40 
d.  73 
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Answer: (c).40
