Quant 2nd Edition – PS Questions 151-160

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)

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