Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
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
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

This Question is Closed

wioBest 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

wioBest 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

BAdhiBest 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
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.