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Averages 1/3

13. The average weight of the students of a class is 40 kgs. 5 new students with the average weight of 46 kgs having joined the class, the average weight of the class is increased by 2 kg. Find the number of students in the class originally?
a. 10
b. 12
c. 14
d. 16


14. Average temperature from ${9^{th}}$ to ${16^{th}}$ of a month is ${\rm{30}}^{\rm{o}} {\rm{C}}$ and that from ${10^{th}}$ to ${17^{th}}$ is ${\rm{31}}^{\rm{o}} {\rm{C}}$. What is the temperature on ${17^{th}}$, if temperature on ${9^{th}}$ is ${\rm{35}}^{\rm{o}} {\rm{C}}$?
a. 35
b. 37
c. 39
d. 43


15. The average of 11 observations is 72. If average of first 6 observations is 70 and that of last 6 observations is 71, then the 6th observation is:
a. 51
b. 54
c. 55
d. 56


16. Average expenditure of a person for the first 3 days of a week is Rs. 350 and for the next 4 days is Rs. 420. Average expenditure of the man for the whole week is:
a. 350
b. 370
c. 390
d. 430


17. 11 friends went to a hotel and decided to pay the bill amount equally. But 10 of them could pay Rs. 60 each as a result 11th has to pay Rs. 50 extra than his share. Find the amount paid by him.
a. 110
b. 111
c. 115
d. 123


18. The average marks obtained by some students in an examination is 54. If 20% of the students got a mean score of 90 marks and the 30% of the students got a mean score of 20. Find the average marks of the remaining students.
a. 60
b. 62
c. 64
d. 66


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