Question 468063
This is very easy once you understand Venn diagrams.
Let x=the intersection of farm and fish: .5-x+.6-x+x=.7 the union of farm and fish.
4)1.1-x=.7
x=.4 answer
farm only = .1
fish only = .2
.
5).4/.5=.8
.
6)
.48*.3=.144 male smokers
.52*.2=.104 female smokers
--------------add
======>.248
.
.144/.248 = .58 probability the this person is a man.
.
Ed