OG 12th Problem Solving 21-40

Question 21 – “Running at the same constant…”
OG Explanation is fine.
Khan Academy Link OG 11th Edition #19 - Begins at 9:10

Question 22 – “Of the five coordinates….”
OG Explanation is fine.
Khan Academy Link OG 11th Edition #20 – Begins at 0:00

Question 23 – “If n is a prime number…”
OG Explanation is fine.

Question 24 – “1/(1+1/3) + …”
OG Explanation is fine.

Question 25 – “In the figure above…”
OG Explanation is fine.
Khan Academy Link OG 11th Edition #23 – Begins at 8:30

Question 26 – “A rope 40 feet long is cut into….”
OG Explanation is fine.
Khan Academy Link OG 11th #24 – Begins at 0:00

Question 27 – “A student’s average…”
OG Explanation is fine.

Question 28 – “The average distance between….”
OG Explanation is fine.

Question 29 – “If the quotient a/b is positive…”
OG Explanation is fine.
Khan Academy Link – OG 11th Edition #26 – (3:00)

Question 30 – “The dots on the graph…”
OG Explanation is fine.
Khan Academy Link – #27 - Begins at  4:20

Question 31- “How many minutes does it take John to type…”
OG Explanation is fine. Picking numbers is another option. Say John types 20 words at a rate of 10 words per minute. It must take him 2 minutes. Only B works here.
Khan Academy Link – 11th Edition #28 – 7:35

Question 32 – “Square root of 16(32)….”
OG Explanation is fine
Khan Academy Link – 11th Edition #29 – 9:10

Question 33 – “If O is the center…”
OG Explanation is fine.
Khan Academy Link – #30 – Begins at 0:00

Question 34 – “If Juan takes 11 seconds to…”
OG Explanation is okay. We could just pick numbers. Let y = 2 and x = 4. His total time should be 22 seconds.
Choice A: 11(4) / 2 = 22, CORRECT (looks good but just to make sure another answer doesn’t equal 22)
Choice B: 11(2) / 4 = 22/4 INCORRECT
Choice C: 4 / (2(11)) = 4/22 INCORRECT
Choice D: 11 / (2(4)) = 11/8 INCORRECT
Choice E: 2(4) / 11 = 8/11 INCORRECT
Khan Academy Link – OG 11th Edition #31 1:40

Question 35 – “John has 10 pairs of matched…”
OG Explanation is fine.
Khan Academy Link – OG 11th #32 – 3:50

Question 36 – “What is the lowest…”
OG Explanation is fine.
Khan Academy Link – OG 11th #33 – 6:10

Question 37 – “1/(.75..)
OG Explanation is fine. Alternatively we could keep the decimal in the denominator.

Question 38 – “If 1.5/0.2….”
OG Explanation is fine.
Khan Academy Link #35 –  Begins at 9:40

Question 39 – “In the figure above…”
OG Explanation is okay.
Khan Academy Link #36 – Begins at 0:00

Question 40 – “If n is an integer, which…”
OG Explanation is fine.


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