Answer:
60 people
Explanation:
Let
x = total people in the group
Number of Left-handed people = 12
Percentage of left-handed people = 20%
20% of x = 12
20/100 * x = 12
0.2 * x = 12
0.2x = 12
x = 12/0.2
x = 60 people
x = total people in the group = 60