Quant 2nd Edition – PS Questions 1–10

Question 1 – “The maximum recommended pulse…”

Explanation is fine.

Question 2 – “If x/4 is 2 more than x/8….”

Explanation is okay but I think plugging in the answer choices is faster.

Question 3 – “If Mario was 32 years old….”

Explanation is fine.


Question 4 – “If k is an integer and…”

Explanation is fine but a visual might be faster.   Each time you move the decimal point to the next number on the right,  you multiply by 10.   To get .0010101 > 1000.   You have to move the decimal point 6 places.

Question 5 – “If (b-3)(4+2/b)=0 and…”

Explanation is fine.

Question 6 – “The number 2-0.5 is how many…”

Explanation is okay – probably faster to realize 2-0.5=1.5   and 1-.05=.5 and then to realize 1.5 is 3 times 0.5.   No need to set up variables here.

Question 7 – “In the figure above, if F is….”

Explanation is fine.

Question 8 – “In which of the following pairs..”

Explanation is good.  Remember the reciprocal of number a is 1/a

Question 9 – “The price of a certain…”

Explanation is okay.   A faster way would be to pick numbers.   Using $100 for percent problems is a good choice as $1 is equal to 1%.    If the television started at $100 and was then reduced by 10%, the new price would be $90 (i.e. 10% of $100 is $10).   If the price was reduced further by another 10%, the new price would be $81 (i.e. 10% of $90 is $9).   In total, we saved $19 dollars, which with a starting price of $100 works out to 19% off.


Question 10 – “If there are 664,579 prime…”

Explanation is okay.   A faster way would be to realize 1% of 10 million (i.e. 107) is 100,000 (105).   Since we have about 660,000 prime numbers, we have 6.6 x 100,000;  6.6 × 1% = 6.6%.

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