**Question 151 – “A certain university…”**

OG Explanation is fine.

**Question 152 – “For how many….”**

OG Explanation is fine.

**Question 153 – “The points R, T, and U…”**

OG Explanation is fine

**Question 154 – “A survey of…”**

OG Explanation is okay. This is just a weighted average problem.

**Question 155 – “A certain company….”**

OG Explanation is unnecessarily complicated. This is just a weighted average problem. The average revenue increased by 1%.

This equation says that the weighted average of 1 part car sales and x parts truck sales should equal 1%.

Alternatively, we could go directly to the answer choices. Suppose car sales and truck sales were equal (this is choice C), then revenue would be down 2%. So we need more “weight” on the truck sales. Eliminate D and E. Plug in A as that is easier to plug in.

**Question 156 – “If 4<….”**

OG Explanation is fine.

**Question 157 – “A certain right triangle…”**

OG Explanation is fine. Because the area of the triangle is 1, 0.5xy=1 Thus, xy=2. y>x. Notice that there is nothing stopping a very large value for y. Answer choice A is the only choice that leaves y without a upper limit.

**Question 158 - “A set of numbers has…”**

OG Explanation is fine.

**Question 159 – “A group of store…”**

OG Explanation is fine.

**Question 160 – “A couple…”**

OG Explanation is okay. Alternatively, you could draw out a probability tree. (example: external link: http://www.bbc.co.uk/schools/gcsebitesize/maths/data/probabilityhirev1.shtml)