254 MCGRAW-HILL’S SAT
SAT Practice 5:Connecting to Knowledge
- If xis the average (arithmetic mean) of kand 10,
and yis the average (arithmetic mean) of kand
4, what is the average of xand y,in terms of k?
(A) (B) (C)
(D) 7k (E) 14k
- If, on average, xcars pass a certain point on a
highway in yhours, then, at this rate, how many
cars should be expected to pass the same point
in zhours?
(A) xyz (B) (C)
(D) (E)
Note:Figure not drawn to scale.
- A straight 8-foot board is resting on a rectangular
box that is 3 feet high, as shown in the diagram
above. Both the box and the board are resting on a
horizontal surface, and one end of the board rests
on the ground 4 feet from the edge of the box. If h
represents the height, in feet, of the other end of
the board from the top of the box, what is h?
x
yz
xz
y
z
xy
xy
z
k+ 7
2
k+ 14
2
k+ 14
4
Key formula(s):
Key formula(s):
Key formula(s):
3 feet
4 feet
8 feet
h feet
....
1 2 3 4 5 7 8 9
6
1
0 2 3 4 5 7 8 9
6
1
0 2 3 4 5 7 8 9
6
1
0 2 3 4 5 7 8 9
6