1.  If a boy spends $900 in one month and the average expenditure of that month is $30, find how many days are there, in the month. 
a.   30 
b.   31 
c.   29 
d.   28




2.  If the average marks of 60 students of two classes are 85, and the average marks of 45 students is 75. Find the average marks of the remaining students. 
a.   75 
b.   80 
c.   95 
d.   115




3.  The average value of six numbers 9, 11, 13, 17, 19, and 21, is 15. If 5 are added to each number, what will be the new average? 
a.   20 
b.   21 
c.   23 
d.   25




4.  Find the average of first 31 natural numbers. 
a.   32 
b.   16 
c.   14 
d.   26




5.  Find the average of 8 consecutive numbers 7, 8, 9, 10, 11, 12, 13 and 14. 
a.   10.5 
b.   10 
c.   11.5 
d.   11




6.  Find the average of first 40 consecutive even number. 
a.   41 
b.   42 
c.   40 
d.   22




7.  A man goes to a certain place with the speed of 15 miles per hour and comes back to the original place with the speed 21 miles per hour. Find the average speed, during the whole journey. 
a.   17 miles /hr. 
b.   17.5 miles /hr. 
c.   18 miles /hr. 
d.   18.5 miles /hr.




8.  A bus covers 20% of the journey at 20 mile/hr, 40% of the journey at 30 mile/hr and the remaining at 20 mile/hr. Find the average speed of the bus during the entire journey. 
a.   331/15mile/hr. 
b.   300/13mile/hr. 
c.   287/13mile/hr. 
d.   13/22 mile/hr.




9.  Find the average of first 10 multiples of 5. 
a.   55.8 
b.   70 
c.   50 
d.   27.5




10.  The average of 4 consecutive even numbers is 25. Find the difference between the highest, and lowest of these numbers? 
a.   4 
b.   6 
c.   1 
d.   3




11.  The average of 7 consecutive odd numbers is 77. Find the difference between the highest and lowest of these numbers? 
a.   3 
b.   6 
c.   16 
d.   12




12.  The average of 30 numbers is 22. If two numbers, 15 and 20 are discarded, then the average of the remaining numbers is nearly: 
a.   35 
b.   15.8 
c.   20 
d.   22.3



