hello all,
i'm preparing for the gre and have trouble solving the following questions. can anybody tell me the answer but most importantly the associated formula?
In the sunshine, an upright pole 12 feet tall is casting
a shadow 8 feet long. At the same time, a nearby
upright pole is casting a shadow 10 feet long. If the
lengths of the shadows are proportional to the
heights of the poles, what is the height, in feet, of
the taller pole?
A 10
B 12
C 14
D 15
E 18
If c and d are positive integers and m is the greatest
common factor of c and d, then m must be the
greatest common factor of c and which of the
following integers?
A c + d
B 2 + d
C cd
D 2d
E d ^ 2
The average (arithmetic mean) of 100 measurements is 23, and the average
of 50 additional measurements is 27.
Quantity A
The average of the 150 measurements
Quantity B
25
If 1/2^m + 1/2^m = 1/2^x, then x expressed in terms of m is
A
m/2
B m-1
C m+1
D 2m
E m^2
btw, how do can I post images of a pdf doc?
