12.Practice.Tests.for.the.SAT_2015-2016_1128p

12 Practice Tests for the SAT
220
Practice Test Two Answers an d Exp l anations
6. D
Difficu l ty: Medium
Strategic A d vice: Use the slope formula to find the missing
coordinate.
Getting to t h e Answer:
7. B
m= Y 2 - Y1
x 2
- x1
-12= 5 z -7-5
-(-3)
-12=-=12 5 z + 3
5=z+3
2=z
Difficu l ty: Medium
Strategic A d vice: There are variables in the question and
variables in the answer choices, so pick numbers to get to
the answer quickly.
Getting to t h e Answer:
Let h = 1. After the first hour at 5 miles per hour, Jerry will
have traveled 5 miles, leaving 45 miles to go. Plug l into
your answer choices and see which one gets you 45.
(A)
5
i(
50
) = -= 50 10
l 5
(B) 50 - 5(1) = 50 - 5 = 45
(C) 250(1) = 250
(D) 50 5
- T
= 50 - 5 = 45
(E) 5( l) - 50 = 5 -45 = -40
Eliminate
OK
Eliminate
OK
Eliminate
Now decide between (B) and (D) using the second
hour. After the second hour at 5 miles per hour, Jerry
will have traveled l 0 miles, leaving 40 miles to go. Plug
2 into your answer choices and see which one gets
you 40.
(B) 50 - 5(2) = 50 - 10 = 40
(D) 50 - % = 50 - 2.5 = 47.5 Eliminate
8. B
Difficu l ty: Medium
Strategic A d vice: You won't have to use complicated math
in every problem. Sometimes using common sense and
knowledge of SAT basics will be enough.
Getting to t h e Answer:
The ratio of teachers to students is l to l 0. That could
mean that there are l teacher and l 0 students, 50 teachers
and 500 students, or some other numbers with that ratio.
Teachers and students can be divided into groups of 11,
each of which contains l teacher and l O students. The total
number of teachers and students in the school, then, must
be a multiple of 11. Of the answer choices, only (B) is a
multiple of 11 .
9. c
Difficu l ty: Medium
Strategic A d vice: When solving percent problems, make
sure you place the decimal point in the right place. You
could also pick numbers if you get stuck.
Getting to t h e Answer:
0.60 x 20y= 12y
10. E
Difficu l ty: Medium
Strategic A d vice: The number of cats, c, and the number
of dogs, d, are inversely proportional to each other, so the
equation c = (where k is a constant) describes their
relationship. First, solve for k. Once you have k, you can
solve for either quantity given the other.
Getting to t h e Answer:
You are given the values c = l O and d = 50, so
10=-k
50
k=500
Then when d = 20, c = 5 2
° 0
° = 25.
11. E
Difficu l ty: Medium
Strategic A d vice: To find the answer choice that must be
true, eliminate the ones that are sometimes or always false.