We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
+1
228
1
avatar+429 

 

smileysmileysmiley

 Apr 21, 2018
 #1
avatar+101768 
+2

 

\(x(x-2)+x+2x+8+10=60\\ x^2-2x+3x+18=60\\ x^2+x-42=0\\ (x-6)(x+7)=0\\ \text{x has to be positive so it is 6}\)

 

 

Number that are british is x+2x+8 = 3x+8 = 18+8 = 26

 

\(P(british)=\dfrac{26}{60}=\dfrac{13}{30}\)

 

EDIT:    Sorry this is not  right

I overlooked the fact that the painting must be from the 20th century (T) to start with.

There are 30 in from the 20th century

6 of those are british

 

P( that it is british given that it IS from the 20th century) = 6/30 = 0.2

.
 Apr 21, 2018
edited by Melody  Apr 21, 2018

12 Online Users

avatar
avatar