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Can anyone help me with this question? It’s from the official focus book for this year

Not understanding why for S they used even numbers to form their sequence

Also how did they get that average?
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deanthedaydreamer
Not understanding why for S they used even numbers to form their sequence
How is the sequence even for S ?
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Not understanding why for S they used even numbers to form their sequence
see the difference will always be 2 in consecutive odd/even integers like take example of series 1, 3, 5, 7, 9 so the difference will always be 2
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Eth3R
see the difference will always be 2 in consecutive odd/even integers like take example of series 1, 3, 5, 7, 9 so the difference will always be 2
Ah that makes sense thank you, and how did they get 90 and 20 for the fractions?

When Solving the averages
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Ah that makes sense thank you, and how did they get 90 and 20 for the fractions?
use Arithmetic progression. formula taking 2 common so sequence will become (1+2+3+...+9) similarly for 20
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Can anyone help me with this question? It’s from the official focus book for this year
This question is discussed in detail here: list-s-consists-of-10-consecutive-odd-integers-and-list-t-consists-of-166833.html

List S consists of 10 consecutive odd integers, and list T consists of 5 consecutive even integers. If the least integer in S is 7 more than the least integer in T, how much greater is the average (arithmetic mean) of the integers in S than the average of the integers in T?

(A) 2
(B) 7
(C) 8
(D) 12
(E) 22

For any evenly spaced set median = mean = the average of the first and the last terms.

So the mean of S will be the average of the first and the last terms: mean = (x + x + 9*2)/2 = x+9, where x is the first term;

The mean of T will simply be the median or the third term: mean = (x - 7) + 2*2 = x - 3;

The difference will be (x + 9) - (x - 3) = 12.

Answer: D.
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Ah I see, thank you guys! Also still getting the hang of the app haha
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Hi Everyone, I’ve been following GMAT Ninja’s 13-week study plan for 3 weeks, I have hit a roadblock in quant where my careless errors have been in the range of 7-15% week on week for questions majorly of 500-600 level on GMAT club. I am bit worried as my target is above 80 on quant. Can you guys please suggest a way forward as I have started the course for Week 4 but as per Charles’s suggestion on how to review your error log, I think i should take out time this week for eradicating these errors by practicing set of 25-30 questions of mixed topics( exclusively OG) starting from sub-500 level and then progressing with the same methodology for 500-600 level. Any additions or other suggestions?
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Check yet another tricky Arithmetic problem from GMAT Club tests: https://gmatclub.com/forum/which-of-the ... 26854.html
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C
Sorry for the typo it’s D
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