This is for SAT in Jan 2016 or before.
The following are worked solutions for the questions in the math sections of the SAT Practice Tests found in the The Official SAT Study Guide Second Edition.
It would be best that you go through the SAT practice test questions in the Study Guide first and then look at the worked solutions for the questions that you might need assistance in. Due to copyright issues, we are not able to reproduce the questions, but we hope that the worked solutions will be helpful.
11. Correct answer: 135
The value of x
Topic(s): Pairs of angles
b = a = 25 (vertical angles)
20 + x + b = 180 (supplementary angles)
⇒ 20 + x + 25 = 180 ⇒ x = 135
12. Correct answer: 46
The median of a set of 9 consecutive integers is 42
The greatest of these 9 integers
Median is the middle value of a list when the numbers are in order.
The middle value of the 9 numbers would be the fifth number.
The greatest number will be the 9th number, which is 42 + 4 = 46
13. Correct answer: 28
f(x) = x + 1
2f(p) = 20
Given the function f(x) = x + 1
2f(p) = 2(p +1) = 20 ⇒ p + 1 = 10 ⇒ p = 9
f(3p) = f(3 × 9) = f(27) = 27 + 1 = 28
14. Correct answer: 70
The value of x
Topic(s): Types of triangles, pairs of angles
means that LMN is an isosceles triangle.
The base angles of an isosceles triangle are equal.
Let a = angle LNM = angle LMN
125 + a = 180 (supplementary angles)
⇒ a = 55
a + x = 125 (corresponding angles)
⇒ 55 + x = 125 ⇒ x = 70
15. Correct answer: 7/15
cup of orange juice
Filled to 1 cup with a mixture that contains equal amounts of orange, grapefruit and pineapple juices
The fraction of the final mixture that is orange juice
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