0.19 is ten times as great as 0.019

(a) 5

(b) 10

(c) 10

Step-by-step explanation:

There are 20 people who like A or B.  There are 4+6=10 people who like B, so there are 10 people who like A but not B (the region of the Venn diagram that is outside B and inside A).  This answers part b.

Since there are 3 people who like A only, there are 10−3=7 people who like A and C but not B (the intersection of A and C that is outside B).

Next, there are 22 people who like B or C.  There are 4+6=10 people who like B, and 7 people who like A and C but not B.  Therefore, there are 22−10−7=5 people who like C only.  This answers part a.

Finally, there are 7 people who don't like A or C (the region of the diagram that is outside of the circles but inside the rectangle).  And as previously found, there are 5 people who like C only.  So the number of people who don't like A or B (but may or may not like C) is 7+5=12.