1. The average of a and -5 is 10, a=
(a) 25
(b) 15
(c) 5
(d) -5)
(e) -15


2. The average of 6 consecutive integers is 18.5, 
   what is the average of the first 5 of these numbers ?
(a) 12.5
(b) 15
(c) 16
(d) 17.5
(e) 18

3. What is the average weight of the 5 people whose weights 
   are 150,153,154,157 and 151.
(a) 152
(b) 153
(c) 153.5
(d) 154
(e) 155