+0  
 
+1
185
1
avatar+429 

 

smileysmileysmiley

 Apr 21, 2018
 #1
avatar+99214 
+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

35 Online Users

avatar
avatar
avatar
avatar