Spain only = 7
Number of students that have neither visited Spain, France and Germany = 6
Explanation:
Number of students that have been to spain = 19
Number that have been to spain only = ?
Number of students that have been to spain = 3 + 3 + 6 + Spain only
19 = 3 + 3 + 6 + Spain only
19 = 12 + Spain only
Spain only = 19 - 12
Spain only = 7
Number of students that have neither visited Spain, France and Germany = ?
Total students = 38
38 = 5 + 4 + 6 + 3 + 4 + 3 + spain only + number that have not visited any of the 3 countries
38 = 5 + 4 + 6 + 3 + 4 + 3 + 7 + number that have not visited any of the 3 countries
38 = 32 + number that have not visited any of the 3 countries
38 - 32 = number that have not visited any of the 3 countries
number that have not visited any of the 3 countries = 6
Number of students that have neither visited Spain, France and Germany = 6
