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

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984<br />

12 Practice <strong>Tests</strong> <strong>for</strong> <strong>the</strong> <strong>SAT</strong><br />

Practice Test Eleven Answers and Explanations<br />

4. E<br />

Difficulty: Low<br />

Strategic Advice: If part of a problem seems complicated,<br />

try to rewrite it in a simpler way. In this case, 9.87654 x l 0 4<br />

can be written much more simply.<br />

Getting to <strong>the</strong> Answer:<br />

9.87654 x l 0 4 = 98,765.4<br />

5. c<br />

Difficulty: Medium<br />

Strategic Advice: To find <strong>the</strong> average of a set of numbers,<br />

divide <strong>the</strong> sum of <strong>the</strong> numbers by <strong>the</strong> number of numbers.<br />

This is a very important <strong>for</strong>mula.<br />

Getting to <strong>the</strong> Answer:<br />

0(5) + l (4) + 2(5) + 3(4) + 4(2)<br />

20<br />

0 + 4 + 10 + l 2 + 8 34<br />

=<br />

= = 1<br />

20 20 ·7<br />

6. B<br />

Difficulty: Medium<br />

Strategic Advice: This problem involves two concepts that<br />

appear very frequently on <strong>the</strong> <strong>SAT</strong>. First, <strong>the</strong> sum of <strong>the</strong><br />

interior angles of any triangle is 180 degrees. Second, all<br />

<strong>the</strong> variables in <strong>the</strong> problem can be written in terms of one<br />

variable, in this case a.<br />

Getting to <strong>the</strong> Answer:<br />

a+b +c= 180<br />

a + 2a + 3a = 180<br />

7. c<br />

60 = 180<br />

a=30<br />

Difficulty: Medium<br />

Strategic Advice: This problem revolves around translating<br />

from English to math. You'll need to choose a variable to<br />

represent <strong>the</strong> number of apples in <strong>the</strong> sack be<strong>for</strong>e <strong>the</strong><br />

addition (<strong>for</strong> instance, x), <strong>the</strong>n set up an equation using<br />

<strong>the</strong> in<strong>for</strong>mation in <strong>the</strong> first sentence, and finally solve that<br />

equation <strong>for</strong> x.<br />

Getting to <strong>the</strong> Answer:<br />

x+4=3x<br />

8. E<br />

4=2x<br />

2=x<br />

Difficulty: Medium<br />

Strategic Advice: In many geometry problems, you'll need<br />

to draw your own figure or (as in this case) add something<br />

to a given figure to help you solve a problem. You'll also<br />

need to remember that <strong>the</strong> sum of <strong>the</strong> interior angles of a<br />

triangle and <strong>the</strong> sum of <strong>the</strong> angles along a straight line are<br />

both 180 degrees.<br />

Getting to <strong>the</strong> Answer:<br />

First, sketch a line perpendicular to I and m:<br />

100°<br />

60°<br />

80°<br />

The three angles along <strong>the</strong> new line add up to l 80 degrees:<br />

l 0 + d + 30 = l 80<br />

9. c<br />

d+40= 180<br />

d= 140 ·<br />

Difficulty: Medium<br />

Strategic Advice: Always read <strong>the</strong> question carefully. This<br />

question doesn't ask <strong>for</strong> <strong>the</strong> value of x or <strong>the</strong> sum of x + 6<br />

and x - 2. Instead, it asks <strong>for</strong> <strong>the</strong> difference between <strong>the</strong> two<br />

expressions. Although <strong>the</strong> algebraic method is shown below,<br />

Picking Numbers is also a good way to solve this problem.<br />

Getting to <strong>the</strong> Answer:<br />

(x + 6) - (x - 2) = 6 - (-2) = 8

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