OG 12th Data Sufficiency 1-20



Question 1 – “What is the value of….”
OG Explanation is fine.
Khan Academy (OG 11th) Question 3 – Begins at 5:25

Question 2 – “What percent of a group of people…”
OG Explanation is fine.
Khan Academy (OG 11th) Question 7 – Begins at 3:20

Question 3 – “In a certain class, one student is to…”
OG Explanation is fine.
Khan Academy (OG 11th) Question 10 – Begins at 0:00

Question 4 – “In College X the number of students enrolled in both…”
OG Explanation is fine.

Question 5 – “A certain expressway has exits J, K…..”
OG Explanation is fine. It may be easier to draw it out.
Khan Academy (OG 11th) Question 13 – Begins at 5:10

Question 6 – “If n is an integer…..”
OG Explanation is fine.
Khan Academy (OG 11th) Question 17 – Begins at 0:45

Question 7 – “For which type of investment, J or ……”
OG Explanation is fine.

Question 8 – “A citrus fruit grower receives $15….”
OG Explanation is fine.

Question 9 – “If Pat saved $600 of his earnings last….”
OG Explanation is fine.

Question 10 – “Water is pumped into a partially filled…”
OG Explanation is fine.
Khan Academy (OG 11th) Question 19 – Begins at 3:45

Question 11 – “Is x a negative number….”
OG Explanation is fine.
Khan Academy (OG 11th) Question 20 – Begins at 6:30

Question 12 – “If i and j are integers is….”
OG Explanation is fine. Alternatively for Statement 2, if integer i and j are both odd, then i+j = even. If integer i and j are both even, then i + j = even.


Question 13 – “The charge for a telephone call between City R…”
OG Explanation is fine.

Question 14 – “If Car X followed Car Y across a certain bridge…”
OG Explanation is fine.

Question 15 – “If n + k = m…..”
OG Explanation if fine.
Khan Academy (OG 11th) Question 26 – Begins at 7:50

Question 16 – “Is x an integer…”
OG Explanation is fine.
Khan Academy (OG 11th) Question 28 – Begins at 0:00

Question 17 – “Is the integer p odd…”
OG Explanation is fine.

Question 18 – “What is the maximum number of rectangular blocks…”
OG Explanation is okay. Statement 1 tells us there are 25 blocks on the bottom layer but we know nothing about the height of the box or how many layers there are. INSUFFICIENT.
Statement 2 tells us the dimensions of the box. Once we know the dimensions, we can figure out the maximum number of blocks that could fit in the box. SUFFICIENT. There is no need for calculation in this problem.

Question 19 – “If sequence S has 200 terms….”
OG Explanation is fine.

Question 20 – “In triangle PQR if PQ=x QR=x+2…”
OG Explanation is fine. It may be easier to draw a picture.
Khan Academy (OG 11th) Question 32 – Begins at 7:10


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