OG 12th Problem Solving 1-20

Question 1 – “A project scheduled to be carried…”
OG Explanation is fine.
Khan Academy Link: OG 11th Edition #1 – Begins at 0:00

Question 2 – “If the sum of 5, 8, 12, and….”
OG Explanation is fine.

Question 3 – “For which of the following values…..”
OG Explanation is fine.
Khan Academy Link: OG 11th Edition #2 – Begins at 1:20

Question 4 – “Rectangular Floors X and Y….”
OG Explanation is fine.
Khan Academy Link: OG 11th Edition #3 – Begins at 2:25

Question 5 – “The table above shows the number of employees…”
OG Explanation is fine.

Question 6 – “A case contain c cartons. Each carton contains b….”
OG Explanation is fine. Alternatively you could just pick numbers. Suppose in each case there are 2 cartons (i.e. c = 2) and that in each carton, there are 5 boxes (b = 5). Therefore, in each carton there are 500 paperclips. Since there are 2 cartons in each case there are 1000 paperclips in a case. In 2 cases, there must be 2000 paperclips. Going to the answer choices:
Choice A = 100 x 2 x 5 = 1000 INCORRECT
Choice B = (100 x 5) / 2 = 250 INCORRECT
Choice C = 200 x 5 x 2 = 2000 CORRECT
Choice D = (200 x 5) / 2 = 500 INCORRECT
Choice E = 200 / ( 5 x 2 ) = 20 INCORRECT
Khan Academy Link: OG 11th Edition #4 – Begins at 3:40

Question 7 – “The sum of the prime numbers…”
OG Explanation is fine.
Khan Academy Link: OG 11th Edition #5 – Begins at 5:30

Question 8 – “A rainstorm increased the amount….”
OG Explanation is fine. Notice that “approximately how many billion gallons” suggests that an exact calculation is unnecessary.
Khan Academy Link OG 11th Edition #6 – Begins at 6:30

Question 9 – “On the graph above…”
OG Explanation is okay.
Khan Academy Link OG 11th Edition #7 – Begins at 0:00

Question 10 – “When 1/10 percent of 5,000 is subtracted….”
OG Explanation is fine.
Khan Academy Link OG 11th Edition #8 – Begins at 1:50

Question 11 – “Which of the following….”
OG Explanation is fine.
Khan Academy Link OG 11th Edition #9 - Begins at 2:45

Question 12 – “Raffle tickets numbered consecutively…”
OG Explanation is fine. Make sure you add 1 to the difference of the largest number and smallest number when finding out how many numbers are in an inclusive set.
Khan Academy Link OG 11th Edition #10 – Begins at 5:20

Question 13 – “When Leo imported a certain item…”
OG Explanation is fine.

Question 14 – “On Monday, a person mailed…”
OG Explanation is fine. Alternatively, the packages on Monday to the Packages on Tuesday exist in a 2 to 1 ratio. So you could just do the weighted average by taking the sum of 2 times 12 3/8 + 15 1/4 all divided by 3.
Khan Academy Link OG 11th Edition #11 – Begins at 9:05

Question 15 – “ 0.1 + (.01)^2 + ….”
OG Explanation is fine.
Khan Academy Link OG 11th Edition #12 – Begins at 0:00

Question 16 – “A carpenter constructed a rectangular….”
OG Explanation is fine.
Khan Academy Link OG 11th Edition #13 – Begins at 0:55

Question 17 – “A bakery opened yesterday with…”
OG Explanation is fine.
Khan Academy Link OG 11th Edition #15 - Begins at 4:20

Question 18 – “If the area of a square region…”
OG Explanation is fine.

Question 19 – “150 is what percent…”
OG Explanation is fine.
Khan Academy Link OG 11th Edition #17 – Begins at 6:50

Question 20 – “The ratio 2 to …”
OG Explanation is okay. First, get all the fractions to be whole numbers. The ratio 2 to 1/3 is equal 2(3) to (1/3)(3) which equals 6 to 1.
Khan Academy Link OG 11th Edition #18 – Begins at 8:40


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