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ParthKohli
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I found this easy problem in the grade 8th entrance exam... try it :)
Let \(\large x_1, x_2, x_3 \cdots x_n\) be a sequence such that \(\large \sum \limits_{i = 1}^{n} (x_i  3) = 170 \) and \(\large \sum \limits_{i = 1}^{n} (x_i  6) = 50\). What is the value of \(n\)?
 one year ago
 one year ago
ParthKohli Group Title
I found this easy problem in the grade 8th entrance exam... try it :) Let \(\large x_1, x_2, x_3 \cdots x_n\) be a sequence such that \(\large \sum \limits_{i = 1}^{n} (x_i  3) = 170 \) and \(\large \sum \limits_{i = 1}^{n} (x_i  6) = 50\). What is the value of \(n\)?
 one year ago
 one year ago

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wio Group TitleBest ResponseYou've already chosen the best response.1
Okay, it's not a hard problem, but it is tedious and requires knowledge about summations that is barely touched in many algebra 2 classes.
 one year ago

wio Group TitleBest ResponseYou've already chosen the best response.1
Multiply the first equation by \(2\) and then add it to the second equation.
 one year ago

BAdhi Group TitleBest ResponseYou've already chosen the best response.1
$$\sum \limits_{i=1}^nx_i=p\\ \sum\limits_{i=1}^nx_i\sum\limits_{i=1}^n3=170 \implies p3n=170\qquad (1)\\ \sum\limits_{i=1}^nx_i\sum\limits_{i=1}^n6=50\implies p6n=50 \qquad(2)$$ (1)(2) 3n=120 => n=40
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.0
@BAdhi :D
 one year ago
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