Real World Applications of the (x-y)/(x+y) Equation

  • Thread starter Thread starter mathisp64
  • Start date Start date
  • Tags Tags
    Difference Sum
AI Thread Summary
The discussion focuses on the real-world applications of the (x-y)/(x+y) equation, particularly in understanding ratios and differences. The original poster shares a scenario involving selling oranges and expresses confusion about the application of the equation, specifically how it yields a 60% result. Another participant clarifies that (x-y)/(x+y) can indicate balance in groups, using a party scenario with girls and boys as an example. The conversation highlights the equation's utility in analyzing proportions and differences in various contexts. Overall, the equation serves as a valuable tool for understanding ratios in real-life situations.
mathisp64
Messages
5
Reaction score
0

Homework Statement


Real world use of (x-y)/(x+y).


Homework Equations


(x-y)/x


The Attempt at a Solution


(x-y)/x solves for the mean difference ratio. I had 400 oranges and sold 100. 400-100/400 gives .75 or 75% remaining. I do not understand where I would use the difference over sum equation. The answer: .6 or 60% using this equation baffles me.

Can anyone set me straight on this.

Thanks!
 
Physics news on Phys.org
welcome to pf!

hi mathisp64! welcome to pf! :smile:
mathisp64 said:
(x-y)/x solves for the mean difference ratio. I had 400 oranges and sold 100. 400-100/400 gives .75 or 75% remaining. I do not understand where I would use the difference over sum equation. The answer: .6 or 60% using this equation baffles me.

you have a party with 70 girls and 62 boys …

(x-y)/(x+y) tells you how unbalanced it is :wink:​
 
Thanks, that was exactly what I was needing to know.
 

Thread 'Finding the number of ways to arrange identical balls in a circle (3 different colors)'

I tried to combine those 2 formulas but it didn't work. I tried using another case where there are 2 red balls and 2 blue balls only so when combining the formula I got ##\frac{(4-1)!}{2!2!}=\frac{3}{2}## which does not make sense. Is there any formula to calculate cyclic permutation of identical objects or I have to do it by listing all the possibilities? Thanks
View full post »

Thread 'Greatest possible value of a constant in polynomial'

Since ##px^9+q## is the factor, then ##x^9=\frac{-q}{p}## will be one of the roots. Let ##f(x)=27x^{18}+bx^9+70##, then: $$27\left(\frac{-q}{p}\right)^2+b\left(\frac{-q}{p}\right)+70=0$$ $$b=27 \frac{q}{p}+70 \frac{p}{q}$$ $$b=\frac{27q^2+70p^2}{pq}$$ From this expression, it looks like there is no greatest value of ##b## because increasing the value of ##p## and ##q## will also increase the value of ##b##. How to find the greatest value of ##b##? Thanks
View full post »

Similar threads

Is (y + z)x1 = (y1 + z1)x the equation of a straight line in 3D space?
Replies
17
Views
2K
Possible values an expression can take : ##\dfrac{x^2-x-6}{x-3}##
Replies
7
Views
1K
Graphs, functions, and coordinates
Replies
2
Views
1K
Derive the equation of a line after x+(1/2)y =0 is mapped by T
Replies
15
Views
2K
What Is the Range of \( y = \sqrt{\ln(\cos(\sin(x)))} \)?
Replies
16
Views
3K
Find the scalar, vector, and parametric equations of a plane
Replies
8
Views
3K
Analyzing and Sketching Function: xy^2-x^2y+x+y=2 | Help with Homework Problem
Replies
6
Views
2K
Solving a system of linear equations
Replies
22
Views
4K
Solving Homework Problem #16ii: Log([x+y]/sqrt5)
Replies
14
Views
2K
Doublecheck homework percentages, and equations
Replies
5
Views
2K

Hot Threads

Recent Insights

Back
Top