Mental Lapse

  • #1
1,235
1
Hello all

I am having a little mental lapse.

If the average score of p students is 70 and the average score of n students is 92, and the average of the scores of p and n is 86, what is p/n?

(70p + 92n)/ ( p + n ) = 86

70p + 92n = 86(p+n)

70p + 92n = 86p +86n
92n = 16p + 86n
6n = 16p
p = 3/8n
n= 8/3p

Where do I go from here (sorry was awake for whole night)

Thanks
 

Answers and Replies

  • #2
BobG
Science Advisor
Homework Helper
185
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Unless you're given either n or p, you're done. You have the ratio between n and p.

If n is 24 students, then p is 9 students; if n is 48 students, then p is 18 students, etc.
 
  • #3
dextercioby
Science Advisor
Homework Helper
Insights Author
12,991
543
You're 'home'. :smile:If
[tex] p=\frac{3}{8}n [/tex]
,then
[tex]\frac{p}{n}=\frac{3}{8} [/tex]

,okay??

Daniel.
 
  • #4
1,235
1
lol

thanks dextercioby

guess it was because i stayed up
 

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