Twelve people in a group are left-handed. Twenty per cent of the group are left-handed.
How many people are in the group?

60 people

Step-by-step 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

-2

7 - 9 = -2

reversed:

-2 + 9 = 7